RE: Stored Outlines and Optimizer Mode

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Thu, 18 Mar 2004 16:10:32 -0600
Message-ID: <0186754BC82DD511B5C600B0D0AAC4D607B00257@EXCHMN3>

Paula

How are you ensuring RULE is used today? Not analyzing tables? That is an issue because CBO needs you to analyze, which will cause everything to be CBO. If the SQL has a hint, then analyze won't be a problem, but you won't get CBO anyway.

Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

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

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Paula Winkler
Sent: Thursday, March 18, 2004 3:35 PM
To: oracle-l_at_freelists.org
Subject: RE: Stored Outlines and Optimizer Mode

Thank you Niall and Lex for your responses.

We have a 3rd-party Oracle8i system running under the RULE-based optimizer. We have identified a handful of poor performing SQLs. We can't change the generated SQLs therefore we are looking into using stored outlines to store the access plans for those exceptional SQLs. Our thought is CBO would kick in for the SQLs with the stored outlines and RBO would kick in for the other acceptable SQLs. Does this sound like it will work?

Paula W.

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Received on Thu Mar 18 2004 - 16:42:15 CST