RE: Rollback Segment Problem

From: SARKAR, Samir <Samir.SARKAR_at_nottingham.sema.slb.com>
Date: Wed, 13 Feb 2002 07:29:05 -0800
Message-ID: <F001.0040DDDA.20020213054827@fatcity.com>

Rafiq,

Just a small question....r the rollback segment extents in the rollback segment tablespace de-allocated when the database is shut down ?? In that case, does the fragmentation remain when the database is restarted or r the blocks coalesced automatically ??

Regards,
Samir

Samir Sarkar
Oracle DBA - Lennon Team
SchlumbergerSema
Email : samir.sarkar_at_nottingham.sema.slb.com

samir.sarkar_at_sema.co.uk
Phone : +44 (0) 115 - 957 6217
EPABX : +44 (0) 115 - 957 6418 Ext. 76217 Fax : +44 (0) 115 - 957 6018

-----Original Message-----
Sent: 12 February 2002 17:49
To: Multiple recipients of list ORACLE-L

Is your tablespace fragmented as it is not finding contingous extent .. TRy to coalesce your subject tablespace and try...

you can use following script to check whether coalesing is required or not.. If percent is < 100 then coalesce it..

select substr(tablespace_name,1,10)TS_NAME,total_extents "Total_Extnts",extents_coalesced,round(percent_extents_coalesced,0) from dba_free_space_coalesced
order by tablespace_name
/

HTH
Regards
Rafiq

Reply-To: ORACLE-L_at_fatcity.com
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: Tue, 12 Feb 2002 02:33:19 -0800

All,

The following is the pitiable scenario I am in and would really appreciate a bit of help :

We were running a long running delete job which gave the following error :

                                 Oracle8 Enterprise Edition Release
8.0.5.2.1 - Production
                                PL/SQL Release 8.0.5.2.0 - Production
                                SQLWKS> EXECUTE

PKG_PAS_AnnualDataMaintenance.Delete_OldData (2000, '/home/sqribe/work/live', '2000AnnualDataDelete.log');

                                ORA-01562: failed to extend rollback segment
number 8
                                ORA-01650: unable to extend rollback segment
RSUNDB08 by 50 in tablespace RSUN425
                                ORA-06512: at
"PAS.PKG_PAS_ANNUALDATAMAINTENANCE", line 66
                                ORA-06512: at line 2

I don't understand why it ran out of rollback space. The rollback segment has a virtually unlimited number of extents, so the only explanation I can see is that this particular rollback segment expanded until it exceeded the space allocation for the whole tablespace RSUN425, which is 3,000M. However, Oracle Storage Manager shows only 200M of the tablespace used, and it also shows high water marks against each rollback segment, none of which exceeds 400M. This would suggest to me that none of the previous month's deletions exceeded 400M per month, so why should it fail on this particular one when it had nearly 3,000M available?

Is there something I am not understanding about rollback segments ??

Thanks and Regards,
Samir

Samir Sarkar
Oracle DBA - Lennon Team
SchlumbergerSema
Email : samir.sarkar_at_nottingham.sema.slb.com

samir.sarkar_at_sema.co.uk
Phone : +44 (0) 115 - 957 6217
EPABX : +44 (0) 115 - 957 6418 Ext. 76217 Fax : +44 (0) 115 - 957 6018

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Author: SARKAR, Samir
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Author: SARKAR, Samir
  INET: Samir.SARKAR_at_nottingham.sema.slb.com

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Received on Wed Feb 13 2002 - 09:29:05 CST