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RE: "snapshot too old" and undo_retention

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Date: Tue, 4 Oct 2005 11:54:11 -0400
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Roger, Tru64 5.1 SAP R/3 4.7
Our BSIS table is only about 1/4 the size of yours. When we run Brconnect the sample size is 3% (from the DBSTATC table) and no histograms are collected. Also, the table is stable/slow growing enough so that stats haven't been refreshed in more than 6 months (and that was due to a DMT to LMT conversion).

I realize each SAP install has its own unique conditions, but your statistics gathering method on this table seems extreme. Some suggestions before considering partitions: 1) look into archiving as Jared mentioned, 2) change Brconnect parameters to use dbms_stats instead of analyze, 3) reduce the frequency that stats are collected (the default is 50% change in # of rows), 5) validate need for histograms & 100% sample size (change DBSTATC), lastly, if 5) can not be reduced, look into collecting stats on another box and import them.


-----Original Message-----
[] On Behalf Of Roger Xu Sent: Friday, September 30, 2005 5:35 PM To: Robyn
Cc: Oracle-L_at_Freelists. Org (E-mail)
Subject: RE: "snapshot too old" and undo_retention

First of thanks to everyone who replied my email. We use SAP tools (brconnect) to collect statistics and it comes out "ANALYZE TABLE ..COMPUTE STATISTICS FOR TABLE FOR ALL INDEXED COLUMNS SIZE 1 FOR ALL INDEXES". We do not have a data warehouse and the table BSIS has 273 million rows. We are on and this table is not partitioned and the table itself is 80 gig in size. Anybody partition this table? How? Thanks.

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Received on Tue Oct 04 2005 - 10:57:10 CDT

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