From oracle-l-bounce@freelists.org Thu Mar 4 16:07:58 2004 Return-Path: Received: from air189.startdedicated.com (root@localhost) by orafaq.com (8.11.6/8.11.6) with ESMTP id i24M7wB09432 for ; Thu, 4 Mar 2004 16:07:58 -0600 X-ClientAddr: 206.53.239.180 Received: from turing.freelists.org (freelists-180.iquest.net [206.53.239.180]) by air189.startdedicated.com (8.11.6/8.11.6) with ESMTP id i24M7uo09422 for ; Thu, 4 Mar 2004 16:07:57 -0600 Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 6FBBC396BAA; Thu, 4 Mar 2004 16:55:11 -0500 (EST) Received: with ECARTIS (v1.0.0; list oracle-l); Thu, 04 Mar 2004 16:54:07 -0500 (EST) X-Original-To: oracle-l@freelists.org Delivered-To: oracle-l@freelists.org Received: from mailhub1.ingenix.com (msp.ingenix.com [12.30.65.145]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id D74D2395ADB for ; Thu, 4 Mar 2004 16:39:05 -0500 (EST) Received: from msp7-sstms1.pcl.ingenix.com (msp7-sstms1.pcl.ingenix.com [10.128.20.82]) by mailhub1.ingenix.com (Postfix) with ESMTP id 27AE460555 for ; Thu, 4 Mar 2004 15:43:06 -0600 (CST) Received: from msp7-msxgw1.pcl.ingenix.com ([172.21.0.85]) by msp7-sstms1 with trend_isnt_name_B; Thu, 04 Mar 2004 15:43:05 -0600 Received: by msp7-msxgw1.ingenix.com with Internet Mail Service (5.5.2657.72) id ; Thu, 4 Mar 2004 15:43:05 -0600 Message-ID: From: Michael Milligan To: "'oracle-l@freelists.org'" Subject: RE: Tuning 9i Database - after migrating from 8i. - Date: Thu, 4 Mar 2004 15:43:04 -0600 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain; charset="iso-8859-1" X-archive-position: 435 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: Michael.Milligan@ingenix.com Precedence: normal Reply-To: oracle-l@freelists.org X-list: oracle-l Great paper by Tim Gorman. Excellent. -----Original Message----- From: Juan Cachito Reyes Pacheco [mailto:jreyes@dazasoftware.com] Sent: Thursday, March 04, 2004 1:13 PM To: oracle-l@freelists.org Subject: Re: Tuning 9i Database - after migrating from 8i. - you have to test what is the best for you, read http://www.evdbt.com/SearchIntelligenceCBO.doc ----- Original Message ----- From: "Wolfgang Breitling" To: Sent: Thursday, March 04, 2004 3:23 PM Subject: Re: Tuning 9i Database - after migrating from 8i. - > I have to admit that I am not a fan of changing them from their default > values. In the databases I am, or have been, working with (Peoplesoft), > changing them usually induces too many NL joins with disastrous consequences. > > In Oracle 9i I would investigate the use of dbms_stats.gather_system_stats > prior to attempting to tweak the O_I_C.. parameters. Joze Senegacnik > reports good success with it. I myself do not have experience with 9i in a > large enough production setting to say. > > At 10:32 AM 3/4/2004, you wrote: > > >I am trying to determine if setting the two spfile parameters > >"optimizer_index_caching" and "optimizer_index_cost_adj" to values of > >other than the default does actually enhance or degrade the SQL queries. > > > >So my questions are > >1. Do you set these parameters ?? > >2. If you do what values work for you ?? > >3. What do you do in a case where it works for most but not for all of > >your SQL?? > > > >TIA. > > > >Yuval. > > Wolfgang Breitling > Oracle7, 8, 8i, 9i OCP DBA > Centrex Consulting Corporation > http://www.centrexcc.com > > > ---------------------------------------------------------------- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > ---------------------------------------------------------------- > To unsubscribe send email to: oracle-l-request@freelists.org > put 'unsubscribe' in the subject line. > -- > Archives are at http://www.freelists.org/archives/oracle-l/ > FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html > ----------------------------------------------------------------- > ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- This e-mail, including attachments, may include confidential and/or proprietary information, and may be used only by the person or entity to which it is addressed. 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