Try removing optimal setting, and shrinking RBS to the min extents (or even below) before running
your tests.
- Kirti
- Garry Gillies <g.gillies_at_weir.co.uk> wrote:
> From memory (of a course attended looong ago),
> Oracle recommends one rollback segment for every
> three to four users.
> Four rollback segments between thirty six processes
> does seem a little mean.
>
> Garry
>
>
>
>
>
> <rgaffuri_at_cox.net>
> Sent by: root_at_fatcity.com
> 04/06/03 13:59
> Please respond to ORACLE-L
>
>
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> cc:
> Subject: Snapshot too old during stress test... how to avoid
>
>
> Im testing worst case scenarios right now. So Im doing batch
> updates,inserts,deletes and 'create table as' from a staging tablespace of
> approximately 5GBs to a master tablespace of approximately 11GBs.
>
> Ive got my job queue processes set to 36 and Im running 36 at a time in
> the background in order to gather statistics and timing under worst case
> scenarios.
>
> Im in 8.1.7.3 and I have increased the size of my RBS tablespace to 11GB
> for this test. I have 4 standard RBS with optimal size set to 1GB. Why
> would I get a snapshot too old? I would think that 11GBs of rollback would
> be big enough. Would increasing the number of Rollback segments avoid this
> even though I have the same amount of space in the tablespace?
>
> In reality Im going to seriallize the process to avoid this and to improve
> performance, however, I want to stress the system.
>
> any advice?
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: <rgaffuri_at_cox.net
> INET: rgaffuri_at_cox.net
>
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Kirtikumar Deshpande
INET: kirtikumar_deshpande_at_yahoo.com
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Received on Wed Jun 04 2003 - 11:45:00 CDT
