RE: ALTER ROLLBACK SEGMENT rbs SHRINK

From: Johnston, Tim <TJohnston_at_quallaby.com>
Date: Wed, 30 Jan 2002 09:26:32 -0800
Message-ID: <F001.004008F5.20020130084534@fatcity.com>

You know what? I thought the same thing... But, the curious side of me decided to give it a try to be sure... And guess what... It works? Learn something new everyday...

SQL> select segment_name,sum(bytes) from dba_segments where tablespace_name = 'RBS' and segment_name

• 'RBS17' group by segment_name;

SEGMENT_NAME SUM(BYTES)

------------------------ ----------
RBS17                      22364160

SQL> select rs.optsize, rs.extents
  2 from dba_rollback_segs drs,
  3 v$rollstat rs
  4 where drs.segment_name = 'RBS17'
  5 and drs.segment_id = rs.usn;

   OPTSIZE EXTENTS
---------- ----------
  22020096 21

SQL> alter rollback segment RBS17 shrink to 10M;

Rollback segment altered.

SQL> select segment_name,sum(bytes) from dba_segments where tablespace_name = 'RBS' and segment_name

• 'RBS17' group by segment_name;

SEGMENT_NAME SUM(BYTES)

------------------------- ----------
RBS17                       10649600

SQL> select rs.optsize, rs.extents
  2 from dba_rollback_segs drs,
  3 v$rollstat rs
  4 where drs.segment_name = 'RBS17'
  5 and drs.segment_id = rs.usn;

   OPTSIZE EXTENTS
---------- ----------
  22020096 10

SQL> 8.1.7.3 on Solaris 2.8

Tim

-----Original Message-----
Sent: Wednesday, January 30, 2002 10:26 AM To: Multiple recipients of list ORACLE-L

no, you can't shrink a rollback segment below the optimal value

• Sinard Xing <sinardyxing_at_bcs-ach.com.sg> wrote:
  > Hi,
  >
  >
  > Assume
  > INITIAL * MINEXTENT = 2M and also = OPTIMAL
  >
  > Do you think
  > ALTER ROLLBACK SEGMENT rbs SHRINK TO 1M;
  >
  > will work ?
  >
  >
  >
  > Thanks,
  >
  > Sinardy
  > --
  > Please see the official ORACLE-L FAQ: http://www.orafaq.com
  > --
  > Author: Sinard Xing
  > INET: sinardyxing_at_bcs-ach.com.sg
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Author: Johnston, Tim
  INET: TJohnston_at_quallaby.com

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Received on Wed Jan 30 2002 - 11:26:32 CST