Return-Path: Received: from newsfeed.cts.com (newsfeed.cts.com [209.68.248.164]) by naude.co.za (8.11.2/8.11.2) with SMTP id g4N3MnJ29227 for ; Wed, 22 May 2002 23:22:49 -0400 Received: from fatcity.UUCP (uucp@localhost) by newsfeed.cts.com (8.9.3/8.9.3) with UUCP id MAA93750; Wed, 22 May 2002 12:19:42 -0700 (PDT) Received: by fatcity.com (26-Feb-2001/v1.0g-b71/bab) via UUCP id 0046838E; Wed, 22 May 2002 12:03:40 -0800 Message-ID: Date: Wed, 22 May 2002 12:03:40 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: "Browett, Darren" Sender: root@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: "Browett, Darren" Subject: Optimizer choosing different index Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 71; ListGuru (c) 1996-2001 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Oracle 8.0.5, peoplesoft version 7.51 We have a report that has stopped working due to running out of temporary space. The first step was to check the explain plan. I compared the explain plans between the production database and a dev database that is approx 6 months old. They were very different. Upon review we found that the production database is now using a different index then the dev system. I made a copy of the prod database, deleted the index, and the explain plan and sql performed the same as the dev system. Question I have is, what would cause the cost based optimizer to choose a different index. The only thing that has changed is the number of rows in the source table. Statistics are up-todate, and I have re-built the indexes in question. Thanks Darren ---------------------------------------------------------------------------- ---------------------------------------------- Darren Browett P.Eng This message was transmitted Data Administrator using 100% recycled electrons Information and Communication Technology City of Coquitlam P:(604)927 - 3614 E:dbrowett@city.coquitlam.bc.ca ---------------------------------------------------------------------------- ----------------------------------------------- -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Browett, Darren INET: dbrowett@city.coquitlam.bc.ca Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@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).