Return-Path: Received: from ensim.rackshack.net (root@localhost) by orafaq.net (8.11.6/8.11.6) with ESMTP id gAKIk8r27447 for ; Wed, 20 Nov 2002 12:46:08 -0600 X-ClientAddr: 209.68.248.164 Received: from newsfeed.cts.com (newsfeed.cts.com [209.68.248.164]) by ensim.rackshack.net (8.11.6/8.11.6) with ESMTP id gAKIk8P27440 for ; Wed, 20 Nov 2002 12:46:08 -0600 Received: from fatcity.UUCP (uucp@localhost) by newsfeed.cts.com (8.9.3/8.9.3) with UUCP id HAA43709; Wed, 20 Nov 2002 07:29:38 -0800 (PST) Received: by fatcity.com (26-Feb-2001/v1.0g-b72/bab) via UUCP id 00507D86; Wed, 20 Nov 2002 06:49:09 -0800 Message-ID: Date: Wed, 20 Nov 2002 06:49:09 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: "Sakthi , Raj" Sender: root@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: "Sakthi , Raj" Subject: RE: converting to the cost based optimizer Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 72; ListGuru (c) 1996-2001 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Vivek, As John K Suggested, take a look at Tim's paper "The Search for Intelligent Life in the Cost-Based Optimizer". He discussed the impact of these settings. http://www.evergreen-database.com/ Gaja also discusses these parameters and their possibly optimal values in his paper. You can find that in quest's web site. HTH Cheers, RS --- VIVEK_SHARMA wrote: > > What would be an Optimal Reduced Value of > OPTIMIZER_INDEX_COST_ADJ > to make it favour index searches ? > > Default Value is 100. > > Thanks > > > -----Original Message----- > Sent: Wednesday, November 20, 2002 4:54 PM > To: Multiple recipients of list ORACLE-L > > > One quick hack is to set the "optimizer_..." params > to > make indexes look super-wonderful, which then gives > you a rule-based "look and feel" with hopefully a > little smarter selection of indexes as a bonus > > hth > connor > > --- VIVEK_SHARMA wrote: > > > > Consider using OUTLINES for Fixed Execution plans > > especially for Batch Queries > > > > This will prevent a Sudden Increment in Processing > > Time due to Optimizer choosing NON-Optimal paths > > > > > > -----Original Message----- > > Sent: Wednesday, November 20, 2002 3:20 AM > > To: Multiple recipients of list ORACLE-L > > > > > > We will be in the same process soon. > > We'll have to consolidate over 100 instances to > > something between 40-60 instances and switch from > > RBO > > to CBO. > > > > Any tips are welcome. > > > > > > --- Steve McClure a écrit > : > > > > > I am just starting to look at converting to the > cost > > > based optimizer, and am > > > hoping a few of you can share insights from > having > > > done so in the past. Our > > > application is an oltp system developed on > 7.3.4. > > > > > We made liberal use of > > > +0 and other RBO "hints", and I am wondering if > > > these are going to cause us > > > troubles when switching to CBO. > > > > > > We have been on 8i since April of this year, > and > > I > > > am just now starting to > > > gather information on the inner workings of the > > CBO. > > > I know it is where I > > > want to be, I am just looking to see how > > > painful/painless the transition > > > will be. > > > > > > Steve McClure > > > > > > -- > > > Please see the official ORACLE-L FAQ: > > > http://www.orafaq.com > > > -- > > > Author: Steve McClure > > > INET: smcclure@usscript.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). > > > > ===== > > Stéphane Paquette > > DBA Oracle et DB2, consultant entrepôt de données > > Oracle and DB2 DBA, datawarehouse consultant > > stephane_paquette@yahoo.com > > > > > __________________________________________________________ > > Lèche-vitrine ou lèche-écran ? > > magasinage.yahoo.ca > > -- > > Please see the official ORACLE-L FAQ: > > http://www.orafaq.com > > -- > > Author: =?iso-8859-1?q?paquette=20stephane?= > > INET: stephane_paquette@yahoo.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.com > > -- > > Author: VIVEK_SHARMA > > INET: VIVEK_SHARMA@infosys.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). > > ===== > Connor McDonald > http://www.oracledba.co.uk > http://www.oaktable.net > > "GIVE a man a fish and he will eat for a day. But > TEACH him how to fish, and...he will sit in a boat > and drink beer all day" > > __________________________________________________ > Do You Yahoo!? > Everything you'll ever need on one web page > from News and Sport to Email and Music Charts > http://uk.my.yahoo.com > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > Author: =?iso-8859-1?q?Connor=20McDonald?= > INET: hamcdc@yahoo.co.uk > > 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 > === message truncated === __________________________________________________ Do you Yahoo!? Yahoo! Web Hosting - Let the expert host your site http://webhosting.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Sakthi , Raj INET: rajan_sakthi@yahoo.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).