RE: Should we stop analyzing?

Makes sense, BUT...
"If the data changes A LOT you should of course re-analyze." is assuming you know when that happens. You are assuming communication between users, developers, and DBAs. Communication is my New Year's Resolution.

I would at least suggest exporting stats before changing them. Then there are all the extra problems such as retaining histograms with 8i, applications which constantly insert/delete from temporary tables (not Oracle temp tables), ...

Henry

-----Original Message-----

>>But then I listened to Dave Ensor at the UKOUG conference, and he said
roughly this:

• Stop analyzing after the first analyze. It's the new stats that cause the optimizer to change execution plans.
• "I know that big tables tend to stay big. Small tables stay small. Unique indexes stay unique and non-unique indexes stay non-unique..."
• If the data changes A LOT you should of course re-analyze.

Mogens
<<

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