RE: exp, dbms_stats, RMAN and rollback segments

From: Kirtikumar Deshpande <kirtikumar_deshpande_at_yahoo.com>
Date: Thu, 29 May 2003 10:51:41 -0800
Message-ID: <F001.005A5E8E.20030529105141@fatcity.com>

Steve,
 You may have to dig a little further...  What happened to those table(s) in that schema prior to starting the export? Heavy DML, may be?  

 This could be a case of 'delayed block cleanout'. Export triggered the cleanout and wanted to access the rollback segments.

 If no table data was modified after export started reading that table, then there is no need to read RBS info (except for the DBC case, IMO).

• Kirti
  • "Orr, Steve" <sorr_at_rightnow.com> wrote:
    > Oh yeah, for the export consistent=N
    >
    > -----Original Message-----
    > Sent: Thursday, May 29, 2003 9:14 AM
    > To: 'ORACLE-L_at_fatcity.com'
    >
    >
    > A certain alignment of the planets occurred creating a good ole ORA-01555 error... A user level
    > export received the snapshot too old error and terminated. Concurrent to this was an RMAN backup
    > and DBMS_STATS.GATHER_TABLE_STATS(...) which was being run on the same schema being backed up
    > via the user level export. There was no other end user access to the schema data. Since exp got
    > the error I assume it was reading from the rollback segments but why? I'm suspecting dbms_stats.
    > We have ample RBS. Is there any significant undo generated by dbms_stats or RMAN which could
    > create this problem?
    >
    > (Of course we need to improve our job scheduling but that's another issue, the timing of the
    > user level export is application driven and out of our control).
    >
    >
    > Befuddled in Bozeman,
    > Walt and Steve
    >
    

    ---

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Author: Kirtikumar Deshpande
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Received on Thu May 29 2003 - 13:51:41 CDT