Oracle FAQ | Your Portal to the Oracle Knowledge Grid |
![]() |
![]() |
Home -> Community -> Mailing Lists -> Oracle-L -> RE: Changes to RULE based optimizer between Oracle8 and 9i
Dick Goulet
Senior Oracle DBA
Oracle Certified 8i
DBA
-----Original Message-----
From: Keith Moore [mailto:kmoore7@jcpenney.com]
Sent: Friday, January 30, 2004 11:54 AM
To: Multiple recipients of list ORACLE-L
Subject: Changes to RULE based optimizer between Oracle8 and 9iWe move an application that uses OPTIMIZER_MODE=RULE from Oracle8 to 9i. Most of it is fine, but there are two queries that have a very different execution plan. In one case, the execution time increases from less than a minute to more than an hour. Neither query uses any of the new Oracle 9i features.My understanding is that the Rule optimizer code has not changed, except to account for new features like IOT's. Has anyone else seen this type of behavior?
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Goulet, Dick INET: DGoulet_at_vicr.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Fri Jan 30 2004 - 11:39:33 CST
![]() |
![]() |