x$ktuxe

Script:when transaction will finish rollback

-------------------------------------------------------------------------------
--
-- Script:	rolling_back.sql
-- Purpose:	to predict when transactions will finish rolling back
-- For:		9.0+
--
-- Copyright:	(c) Ixora Pty Ltd
-- Author:	Steve Adams
--
-------------------------------------------------------------------------------
@save_sqlplus_settings

set serveroutput on
set feedback off
prompt
prompt Looking for transactions that are rolling back ...
prompt

declare
  cursor tx is
    select
      s.username,
      t.xidusn,
      t.xidslot,
      t.xidsqn,
      x.ktuxesiz
    from
      sys.x$ktuxe  x,
      sys.v_$transaction  t,
      sys.v_$session  s
    where
      x.inst_id = userenv('Instance') and
      x.ktuxesta = 'ACTIVE' and
      x.ktuxesiz > 1 and
      t.xidusn = x.ktuxeusn and
      t.xidslot = x.ktuxeslt and
      t.xidsqn = x.ktuxesqn and
      s.saddr = t.ses_addr;
  user_name  varchar2(30);
  xid_usn    number;
  xid_slot   number;
  xid_sqn    number;
  used_ublk1 number;
  used_ublk2 number;
begin
  open tx;
  loop
    fetch tx into user_name, xid_usn, xid_slot, xid_sqn, used_ublk1;
    exit when tx%notfound;
    if tx%rowcount = 1
    then
      sys.dbms_lock.sleep(10);
    end if;
    select
      sum(ktuxesiz)
    into
      used_ublk2
    from
      sys.x$ktuxe
    where
      inst_id = userenv('Instance') and
      ktuxeusn = xid_usn and
      ktuxeslt = xid_slot and
      ktuxesqn = xid_sqn and
      ktuxesta = 'ACTIVE';
    if used_ublk2 < used_ublk1
    then
      sys.dbms_output.put_line(
        user_name ||
        '''s transaction ' ||
        xid_usn  || '.' ||
        xid_slot || '.' ||
        xid_sqn  ||
        ' will finish rolling back at approximately ' ||
        to_char(
          sysdate + used_ublk2 / (used_ublk1 - used_ublk2) / 6 / 60 / 24,
          'HH24:MI:SS DD-MON-YYYY'
        )
      );
    end if;
  end loop;
  if user_name is null
  then
    sys.dbms_output.put_line('No transactions appear to be rolling back.');
  end if;
end;
/

prompt
@restore_sqlplus_settings

VIEW: X$KTUXE – Transaction Entry (table)

View:   X$KTUXE
         [K]ernel [T]ransaction [U]ndo
           Transa[x]tion [E]ntry (table)

  This view is very useful as it gives an indication of the state
  of the transaction tables in the rollback segment headers.
  The information here can be used to see the state of transactions
  requiring transaction recovery do not show in <View:V$TRANSACTION>
  <Event:10013> may be useful to trace transaction recovery.

 Column          Type               Description
 --------        ----               --------
 ADDR            RAW(4|8)           address of this row/entry in the array or SGA
 INDX            NUMBER             index number of this row in the fixed table array
 INST_ID         NUMBER       8.x   oracle instance number

Transaction ID
 KTUXEUSN        NUMBER             undo seg number
       KUSNOLTP UB2MAXVAL           is no-undo xac
 KTUXESLT        NUMBER             slot number
       KSLTINV  UB2MAXVAL           not a valid slot num
 KTUXESQN        NUMBER             wrap number, is savept # at start if no-undo xac
                                     position within transaction

 KTUXERDBF       NUMBER             relative File
 KTUXERDBB       NUMBER             relative Block
 KTUXESCNB       NUMBER             SCN base for prepare/commit
 KTUXESCNW       NUMBER             SCN wrap for prepare/commit
 KTUXESTA        VARCHAR2(16)       Transaction Status
 KTUXECFL        VARCHAR2(24)       Transaction flags
 KTUXEUEL        NUMBER             Used for extent of tx and link to commit list

Distributed tx: collecting dba and undo bk to start retrieving collecting info rec
 KTUXEDDBF       NUMBER             relative file
 KTUXEDDBB       NUMBER             relative dba

Parent transaction id
 KTUXEPUSN       NUMBER       8.x   undo seg number
       KUSNOLTP UB2MAXVAL           is no-undo xac
 KTUXEPSLT       NUMBER       8.x   slot number
       KSLTINV  UB2MAXVAL           not a valid slot num
 KTUXEPSQN       NUMBER       8.x   wrap number, is savept # at start if no-undo xac
                                      position within transaction

 KTUXESIZ        NUMBER       8.1  number of undo blocks used by the transaction

Notes:

To see any DEAD transactions for deferred transaction recovery
  after startup:

      select * from x$ktuxe where ktuxecfl='DEAD';