Return-Path: Received: from ensim.rackshack.net (root@localhost) by orafaq.net (8.11.6/8.11.6) with ESMTP id h8M9sLO28299 for ; Mon, 22 Sep 2003 04:54:22 -0500 X-ClientAddr: 66.27.56.212 Received: from www3.fatcity.com (rrcs-west-66-27-56-212.biz.rr.com [66.27.56.212]) by ensim.rackshack.net (8.11.6/8.11.6) with ESMTP id h8M9sLc28294 for ; Mon, 22 Sep 2003 04:54:21 -0500 Received: (from root@localhost) by www3.fatcity.com (8.11.6/8.11.6) id h8M75Tr28221 for oracle-l@orafaq.net; Mon, 22 Sep 2003 00:05:29 -0700 Received: by fatcity.com (05-Jun-2003/v1.0g-b73/bab) via fatcity.com id 005D0A21; Mon, 22 Sep 2003 00:04:40 -0800 Message-ID: Date: Mon, 22 Sep 2003 00:04:40 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: Mladen Gogala Sender: ml-errors@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: Mladen Gogala Subject: Re: How do we know that an index need to be rebuilt. 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; Format=Flowed; DelSp=Yes; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit There is a Metalink note 77574.1 entitled "Guidelines on When to Rebuild a B- Tree Index" which explains how to use "validate structure" and index_stats table. It is far too scientific to ever put into the script. Explanation for the rule of thumb is simple: if number of index blocks is big that means that the number of deleted entries is likely to be big, so let's rebuild it. As I said, rebuilding indexes is not often necessary and is usually done for all the wrong reasons. Quality of the rule of thumb, therefore, doesn't really matter. On 2003.09.22 03:19, Prem Khanna J wrote: > Read ur interesting reply for the query Mladen and learnt > a new "rule of thumb" from u today. > > i sent the doc. to Raju ONLY adn NOT to the list. > it's just the body of the mail u r seeing there. > > Regards, > Jp. > > 22-09-2003 15:49:40, Mladen Gogala wrote: > > >Attachments are stripped from the list messages. > > >On 2003.09.22 02:24, Prem Khanna J wrote: > >> Hi Raju, > >> Check the doc. i have attached. > > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Prem Khanna J > INET: jprem@kssnet.co.jp > > 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). > -- Mladen Gogala Oracle DBA -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mladen Gogala INET: mgogala@adelphia.net 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).