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Cost vs Rule

From: Magaliff, Bill <Bill.Magaliff_at_lendware.com>
Date: Thu, 07 Mar 2002 11:23:27 -0800
Message-ID: <F001.00422537.20020307112327@fatcity.com>


I work in a dev shop - most of the sql is canned and pretty basic. We've been running CBO in all of our dev environments, but we have a few long txns that just take forever. At the request of some savvy developers, I turned on RBO, and it brought down execution times dramatically.

I've been analyzing affected tables often (we do a lot of bulk load/unload for testing), and have played with partitioning and clustering, particularly on one table that's just a dog. CBO will always do a FTS where RBO uses the PK to retrieve data.

Where to go next? I've been unable to alter the costs dramatically enough to make any real difference in execution time.

thx

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Author: Magaliff, Bill
  INET: Bill.Magaliff_at_lendware.com

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