How do you analyze your Siebel tables for best performance?

Do you use any particular script to analyze Siebel tables? We are having some performance degradation...
Do you use the scripts from Oracle support note 781927.1?
Thank you.

Hi,
We do not follow that document because many years ago we tried following it to the letter and the CBO did not perform very well. Once we saw this we spent many months coming up with a solution. Here is an outline of what we do.
•     Implement the PPS init.ora settings on top of the ones recommended by Oracle for Siebel.
•     Gather both schema and system (the Siebel documentation does not even mention these) stats according to our standards. Here we run dbms_stats for the Siebel schema and sample 100% of the rows and only collect high and low values (for all columns size 1).
•     We always gather our stats in a test environment that is a recent copy of production.
•     We always test our stats before moving them into prod. We use our SQL Playback utility to do this. Likewise you can purchase Oracle’s Real Application Testing.
•     Once tested we then backup the current stats and copy the new stats into production.
The key point here is that we always test our stats. Almost 100% of Oracle DBA’s don’t do this but look for this trend to start changing. Would you ever move a new SRF into production without testing it?
If you are having performance problems and are licensed to use it Oracle’s AWR facility provides you everything you need to find and fix your issues.
HTH,
R
Robert Ponder

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