>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
<[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
04/06/03 13:59
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
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: <[EMAIL PROTECTED]
INET: [EMAIL PROTECTED]
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Garry Gillies
INET: [EMAIL PROTECTED]
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
