With Oracle 9i & Auto Undo Management, Oracle allocates a default
min_extents=2 for the undo segments. And there is nothing one can do to
change it (other than continue using the rollback segment approach). The
min_extents=20 guideline came about from Oracle's internal testing (a very
controlled environment) to find ways to minimize ORA-1555 error.
-----Original Message-----
Sent: Tuesday, January 15, 2002 2:15 PM
To: Multiple recipients of list ORACLE-L
min extents = 20 is not carved in stone. You allocate them with the
number of extents that make sense for your database
the problem is, as new releases come out, old "facts" change and people
keep spreading them anyway
- אדר_יחיאל <adary_at_mehish.co.il> wrote:
> Hello Viktor
>
> Regarding the rollback segments, I heard from Oracle that you need to
> allocate them
> with min extents=20.
> This will cause users to get their own extents and the chance that a
> new
> update will overwrite
> an old update that you need will decrease.
> Check metalink. they have a paper on this error (if I remember
> correctly)
>
> Yechiel Adar, Mehish Computer Services
> adary_at_mehish.co.il
>
> > -----Original Message-----
> > From: Karniotis, Stephen [SMTP:Stephen_Karniotis_at_compuware.com]
> > Sent: Tue, January 15, 2002 8:05 PM
> > To: Multiple recipients of list ORACLE-L
> > Subject: RE: ORA-01555: snapshot too old: rollback segment
> number...
> >
> > You can export with CONSISTENT=N; a consistent view of the data
> will not
> > be
> > achieved. You can also increase the size of your rollback segments
> to
> > accommodate large queries while updates are being performed. There
> is not
> > much else you can do on this one.
> >
> > Thank You
> >
> > Stephen P. Karniotis
> > Technical Alliance Manager
> > Compuware Corporation
> > Direct: (248) 865-4350
> > Mobile: (248) 408-2918
> > Email: Stephen.Karniotis_at_Compuware.com
> > Web: www.compuware.com
> >
> >
> > -----Original Message-----
> > Sent: Tuesday, January 15, 2002 12:20 PM
> > To: Multiple recipients of list ORACLE-L
> > Subject: ORA-01555: snapshot too old: rollback segment number...
> >
> > Hi all,
> >
> > Last nignt when we were expring data for one of our
> > databases, this error ocurred:
> >
> > ORA-01555: snapshot too old: rollback segment number
> > 3 with name "R02") offset=(0).
> >
> > Now, we were able to once again export and load data
> > this morning. And there was no error.
> >
> > What is the best aproach to try to eliminate this
> > error in the future?
> >
> > Any suggestions apreciated.
> >
> > Thanks
> >
> > Regards
> >
> >
> >
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Received on Tue Jan 15 2002 - 15:33:32 CST
