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RE: Rollback Segment Problem

From: Babich , Sergey <SBabich_at_handexmail.com>
Date: Wed, 13 Feb 2002 09:38:47 -0800
Message-ID: <F001.0040E204.20020213085847@fatcity.com> 






Hi, guys,


Just my $0.02, coalescing free space will NEVER eliminate fragmentation. In
many cases you will have to take RB segments offline and drop them, then
re-create. In the interim period you might want to have a big rollback
segment(or a few) in another tablespace. 
Best,


Sergey



-----Original Message-----



Sent: Wednesday, February 13, 2002 11:03 AM
To: Multiple recipients of list ORACLE-L



Samir,


It is not coalesced automatically at shutdown and startup. It is to be 
coalesced manually. It applies to any tablespace with pctincrease set as 
0(zero). I have no idea of 9i but this is normal behaviour of ver 7.3.4 to 
8.1.7...



Regards


Rafiq






Reply-To: ORACLE-L_at_fatcity.com


To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
Date: Wed, 13 Feb 2002 05:48:28 -0800



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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Author: Mohammad Rafiq


  INET: rafiq9857_at_hotmail.com


Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists


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Author: Babich , Sergey


  INET: SBabich_at_handexmail.com


Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists


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Received on Wed Feb 13 2002 - 11:38:47 CST












Original text of this message













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