还是那个hash group by算法的问题，日志文件中出现以下记录:

*** ACTION NAME:(SQL 窗口 - 新建) 2010-09-03 14:27:54.594
*** MODULE NAME:(PL/SQL Developer) 2010-09-03 14:27:54.594
*** SERVICE NAME:(HQYDB1) 2010-09-03 14:27:54.594
*** SESSION ID:(3205.17923) 2010-09-03 14:27:54.594
*** 2010-09-03 14:27:54.594
ksedmp: internal or fatal error
ORA-00600: internal error code, arguments: [32695], [hash aggregation can't be done], [], [], [], [], [], []
Current SQL statement for this session:
create table zou_201008_cell_id as
select /* g_all_cdr02,60 */
calling_num mobile_number,
lac,
lpad(cell_id,5,'0') cell_id,
count(*) c,
sum(call_duration) call_duration,
sum(decode(record_type,'00',1,0)*call_duration) moc_call_duration,
sum(decode(record_type,'01',1,0)*call_duration) mtc_call_duarion
from  g_all_cdr02
where substr(calling_num,1,7) in (select mobile_prefix from zou_mobile_prefix)
group by
calling_num ,
lac,
lpad(cell_id,5,'0')
----- Call Stack Trace -----
calling              call     entry                argument values in hex
location             type     point                (? means dubious value)
-------------------- -------- -------------------- ----------------------------
ksedst+001c          bl       ksedst1              100000000 ? 11055A9A0 ?
ksedmp+0290          bl       ksedst               104A54870 ?
ksfdmp+0018          bl       03F30204
kgeriv+0108          bl       _ptrgl
kgesiv+0080          bl       kgeriv               1050BE654 ? 1050BE604 ?
                                                   0000027E5 ? 080000000 ?
                                                   07FFFFFFF ?
ksesic1+0060         bl       kgesiv               43300000FFFF5310 ?
                                                   4530000000000000 ?
                                                   000000071 ? 000000001 ?
                                                   000000000 ?
qeshPartitionBuildH  bl       01F9CA24
D+04bc
qeshGBYOpenScan2+02  bl       qeshPartitionBuildH  0000027E5 ? 1105C06C0 ?
34                            D
qeshGBYOpenScan+001  bl       qeshGBYOpenScan2     FFFFFFFFFFF5740 ? 11055A938 ?
8                                                  000000000 ? 000000010 ?
qerghFetch+05e8      bl       qeshGBYOpenScan      000001000 ?
rwsfcd+0054          bl       _ptrgl
qerltFetch+036c      bl       03F2EB1C
ctcdrv+4160          bl       01F9C898
opiexe+2884          bl       ctcdrv               100000001 ? 100000001 ?
                                                   110467F30 ?
opiosq0+19f0         bl       opiexe               FFFFFFFFFFF8B50 ?
                                                   2824422142420820 ?
                                                   FFFFFFFFFFF8C10 ?
kpooprx+0168         bl       opiosq0              300000000 ? 000000000 ?
                                                   000000000 ? A4000000000000 ?
kpoal8+0400          bl       kpooprx              FFFFFFFFFFFB464 ?
                                                   FFFFFFFFFFFB068 ?
                                                   1BF000001BF ? 100000001 ?
                                                   000000000 ? A40000000000A4 ?
                                                   000000000 ? 1103878F8 ?
opiodr+0ae0          bl       _ptrgl
ttcpip+1020          bl       _ptrgl
opitsk+1124          bl       01F9F2A0
opiino+0990          bl       opitsk               000000000 ? 000000000 ?
opiodr+0ae0          bl       _ptrgl
opidrv+0484          bl       01F9E0E8
sou2o+0090           bl       opidrv               3C02DC1BBC ? 44065F000 ?
                                                   FFFFFFFFFFFF3A0 ?
opimai_real+01bc     bl       01F9B9F4
main+0098            bl       opimai_real          000000000 ? 000000000 ?
__start+0098         bl       main                 000000000 ? 000000000 ?

--------------------- Binary Stack Dump ---------------------

这次是因为应用人员不了解alter session的作用域，在PL/SQL Developer工具中的不同窗口(也就是不在同一会话中)中执行了”alter session set “_gby_hash_aggregation_enabled” = false;”和涉及group by操作的SQL，并导致了unpublished bug:6471770被触发。
我们比较容易地workaround绕过这个Bug:

/* 在会话级别设置优化参数_gby_hash_aggregation_enabled */

alter session set "_gby_hash_aggregation_enabled" = false;

/* 或者在语句中加入NO_USE_HASH_AGGREGATION的 hint */

select  /*+ NO_USE_HASH_AGGREGATION */ ....

以上提及的unpublished bug:6471770据称在10.2.0.5,11.1.0.7,11.2.0.1版本中被修正了。