Return-Path: Received: from ensim.rackshack.net (root@localhost) by orafaq.net (8.11.6/8.11.6) with ESMTP id h8J2mDv07744 for ; Thu, 18 Sep 2003 21:48:13 -0500 X-ClientAddr: 66.27.56.210 Received: from ns3.fatcity.com (rrcs-west-66-27-56-210.biz.rr.com [66.27.56.210]) by ensim.rackshack.net (8.11.6/8.11.6) with ESMTP id h8J2mC507739 for ; Thu, 18 Sep 2003 21:48:12 -0500 Received: from ns3.fatcity.com (localhost.localdomain [127.0.0.1]) by ns3.fatcity.com (8.12.5/8.12.5) with ESMTP id h8J0A1T6001508 for ; Thu, 18 Sep 2003 17:12:14 -0700 Received: (from root@localhost) by ns3.fatcity.com (8.12.5/8.12.5/Submit) id h8INoPGo031995 for oracle-l@orafaq.net; Thu, 18 Sep 2003 16:50:25 -0700 Received: by fatcity.com (05-Jun-2003/v1.0g-b73/bab) via fatcity.com id 005D06AE; Thu, 18 Sep 2003 16:49:51 -0800 Message-ID: Date: Thu, 18 Sep 2003 16:49:51 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: "Mark Richard" Sender: ml-errors@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: "Mark Richard" Subject: Re: Oracle's use of Indexes Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 73; ListGuru (c) 1996-2003 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Does the query hit any other tables? If so, a different statistic somewhere else might be influencing the optimisor. Otherwise certain session / init parameters can influence the optimisor (multiblock read count, block size even) - Sometimes it can be difficult to track down the culprit but you should be able to find differences somewhere. Craig Munday net.au> cc: Sent by: Subject: Re: Oracle's use of Indexes ml-errors@fatcity .com 19/09/2003 00:54 Please respond to ORACLE-L Craig, Just out of interest, what type of application is running on the database? I was just wondering why you were not using the plan stability features in 8i on your production database. Regards, Craig Munday. At 05:45 AM 2/06/2003 -0800, Craig Healey wrote: >OK, I'm confused. Maybe it's Monday morning and my brain's not working. >We have a production schema and a test schema on the same Oracle 8.1.7 >instance, running on Windows. They both have a customer table, with 3 >million and 2 million records respectively. They both have the same >indexes, and both have been analyzed today. Production used an index and >took 40ms. Test didn't and took 20s. I played around, analyzing, >dropping and creating indexes etc. Now neither of them use the index, >both taking around 20s. >I can add a hint, which works, but I want to know what changed. > >TIA > >Craig Healey > > >********************************************************************************** > >This email and any files transmitted with it are confidential and intended >solely >for the use of the individual or entity to whom they are addressed and may >contain >confidential and/or privileged material. Any review, retransmission, >dissemination >or other use of, or taking of any action in reliance upon, this >information by >persons or entities other than the intended recipient is >prohibited. Statements >and opinions expressed in this e-mail may not represent those of the company. > >If you have received this email in error please notify >system.administrator@hhsuk.com > >This footnote also confirms that this email message has been swept by >MIMEsweeper >for the presence of computer viruses (www.mimesweeper.com) > >*********************************************************************************** > >-- >Please see the official ORACLE-L FAQ: http://www.orafaq.net >-- >Author: Craig Healey > INET: c.healey@hhsuk.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@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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Craig Munday INET: cmunday@bigpond.net.au 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@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). <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Privileged/Confidential information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. In such case, you should destroy this message and kindly notify the sender by reply e-mail or by telephone on (61 3) 9612-6999. Please advise immediately if you or your employer does not consent to Internet e-mail for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of Transurban City Link Ltd shall be understood as neither given nor endorsed by it. <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Privileged/Confidential information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. In such a case, you should destroy this message and kindly notify the sender by reply e-mail or by telephone on (03) 9612-6999 or (61) 3 9612-6999. Please advise immediately if you or your employer does not consent to Internet e-mail for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of Transurban Infrastructure Developments Limited and CityLink Melbourne Limited shall be understood as neither given nor endorsed by them. <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mark Richard INET: mrichard@transurban.com.au 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@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).