深入了解db file parallel read等待事件

我们平日所常见的User I/O类物理读等待事件包括db file sequential read和db file scattered read,相信细心的同学也见过db file parallel read,我们今天来探究一下该db file parallel read(db list of blocks read)等待事件的特质。

 

 

SQL> select * from v$version where rownum=1;

BANNER                                                                               CON_ID
-------------------------------------------------------------------------------- ----------
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production              0
www.askmac.cn

使用目前最新的12c R1 12.1.0.1版本测试

alter session set events '10046 trace name context forever,level 12';

set autotrace traceonly;

alter system flush buffer_cache;               ==》保证物理读

alter session set "_optimizer_batch_table_access_by_rowid"=true;
// BATCH IO一般都会用到db file parallel read

oracle@localhost:~$ strace -o read.log -p 16410 -t -s 200  

在实际操作前使用Strace对IO CALL做TRACE

 select /*+ index(sample ind_t2) */ * from sample where t2 between 1 and 999997;

 

 

 

我们可以从10046 TRACE中获取如下信息, 接着我们到Strace日志中去找对应的SYSCALL:

 

 

1:WAIT #140194991664112: nam='db file sequential read' ela= 12 file#=6 block#=1553 blocks=1 obj#=92176 tim=33606113133
2:WAIT #140194991664112: nam='db file sequential read' ela= 13 file#=6 block#=9324 blocks=1 obj#=92176 tim=33606113191
3:WAIT #140194991664112: nam='db file parallel read' ela= 236 files=1 blocks=13 requests=13 obj#=92176 tim=33606114196
4:WAIT #140194991664112: nam='db file sequential read' ela= 20 file#=6 block#=2192 blocks=1 obj#=92176 tim=33606114373

 

 

我们把10046 trace和 Strace对应起来:

 

 

列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "2
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
0BZ
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
10
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
h
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
BZ
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
02
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
077
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
\ 0
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
0
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
79
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
-p
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
3
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
10
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
0
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
5Y
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
1774
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
55
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
1bD&2460rT66 624602dF(\n5713uW49"..., 8192, 12722176) = 8192 12722176/8192=1553 block# 07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843 632", 117) = 117 对应于2: 07:21:28 pread(257, "2
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
l$0BZ
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
yN
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
h
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
BZ
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
w72
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
!0
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
p
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
\ 13E
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
0
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
5Y
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
0
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
0
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
0
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
0
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
列出Extent MAP:
  1* select extent_id,file_id,block_id ,block_id+blocks-1 from dba_extents where segment_name='SAMPLE'
SQL> /

 EXTENT_ID    FILE_ID   BLOCK_ID BLOCK_ID+BLOCKS-1
---------- ---------- ---------- -----------------
         0          6        176               183
         1          6        184               191
         2          6        192               199
         3          6        200               207
         4          6        208               215
         5          6        216               223
         6          6        224               231
         7          6        232               239
         8          6        240               247
         9          6        248               255
        10          6        256               263
        11          6        264               271
        12          6        272               279
        13          6        280               287
        14          6        288               295
        15          6        296               303
        16          6        384               511
        17          6        512               639
        18          6        640               767
        19          6        768               895

对应于1:

07:21:28 pread(257, "\6\242\0\0\21\6\200\1BZ\36\0\0\0\1\4\211\350\0\0\1\0\0\0\20h\1\0BZ\36\0\0\0\0\0\3\0002\0\0\6\200\1\377\377\0\0\0\
0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\3079\36\0\2\0\37\0\36\7\0\0-p\0\1\203\0010\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\221\2\377\3774\0055\5\1\0\1\0\0\0\221\2b\37D\37&\37\10\37\352\36\314\36\256\36\220\36r\36T\0366\36\30\3
6\372\35\334\35\276\35\240\35\202\35d\35F\35(\35\n\35\355\34\317\34\261\34\223\34u\34W\0349\34\33\34"..., 8192, 12722176) = 8192

12722176/8192=1553  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 221 file#=6 block#=1553 blocks=1 obj#=92176 tim=33620843
632", 117) = 117

对应于2:

07:21:28 pread(257, "\6\242\0\0l$\200\1BZ\36\0\0\0\1\4yN\0\0\1\0\37\0\20h\1\0BZ\36\0\0\0\0\0w\0372\0\3!\200\1\2\0\37\0\36\7\0\0\36p\0\
1\203\1E\0\0\200\0\0\315Y\36\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192, 76382208) = 8192

76382208/8192= 9324  block#

07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844
373", 117) = 117

对应3:
07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000

07:21:28 pread(257,..., 8192, 2269184) = 8192    ==> block#=277
07:21:28 pread(257,..., 8192, 2449408) = 8192    ==> block#=299
07:21:28 pread(257,..., 8192, 4055040) = 8192    ==> block#=495
07:21:28 pread(257,..., 8192, 5382144) = 8192    ==> block#=657
5799936
5832704
5922816
8863744
8937472
9699328
10371072
12042240
13131776
07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849
111", 117) = 117
"..., 8192, 76382208) = 8192 76382208/8192= 9324 block# 07:21:28 write(12, "WAIT #140194991652056: nam='db file sequential read' ela= 175 file#=6 block#=9324 blocks=1 obj#=92176 tim=33620844 373", 117) = 117 对应3: 07:21:28 mmap(0x7f81b0151000, 1114112, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 7, 0) = 0x7f81b0151000 07:21:28 pread(257,..., 8192, 2269184) = 8192 ==> block#=277 07:21:28 pread(257,..., 8192, 2449408) = 8192 ==> block#=299 07:21:28 pread(257,..., 8192, 4055040) = 8192 ==> block#=495 07:21:28 pread(257,..., 8192, 5382144) = 8192 ==> block#=657 5799936 5832704 5922816 8863744 8937472 9699328 10371072 12042240 13131776 07:21:28 write(12, "WAIT #140194991652056: nam='db file parallel read' ela= 3982 files=1 blocks=13 requests=13 obj#=92176 tim=33620849 111", 117) = 117

 

 

 

这里看到db file parallel read 物理读等待事件涉及到的数据块均是不连续的、同时还可以跨越Extent,这点不像db file scattered read。

db file parallel read 等待事件是Oracle 可以对多个数据文件实施并行地物理读取并加载到不连续的内存空间中(可能是PGA也可能是Buffer Cache)。  该db file parallel read 往往出现在 recovery操作或者 buffer prefetch以优化多个单块读的操作中。若该等待事件很突出,一般可以参考db file sequential read的优化方法来调优。

该等待事件的 P1、P2、P3如下:

 

Parameters:
	P1	files	  	Number of files being requested
	P2	blocks		Total number of blocks being requested
	P3	requests	Number of actual AIO requests

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