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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Should we stop analyzing?
That's (partly) what the 9i dynamic sampling feature is for. And such tables are, of course, going to be GTTs.
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
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I'll see your 'analyzed every 4 hours' and raise you one. We have some tables that are analyzed every time they are used! They are 'work' tables that are sometimes empty, very full, or somewhere in between. Running something when the statistics say the table is full but actually is empty takes a little longer when CBO says use indexes; however, if CBO thinks the table is empty and does a FTS when there's actually a million records, well let's just say it takes a while. Hints work sometimes; however, analyzing these table after they are populated and letting CBO do it's job usually works best.
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Author: Jonathan Lewis
INET: jonathan_at_jlcomp.demon.co.uk
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