Received: from localhost (maia-2.hub.org [200.46.204.187]) by postgresql.org (Postfix) with ESMTP id EBC759FB4E3 for ; Mon, 6 Aug 2007 06:42:28 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.187]) (amavisd-maia, port 10024) with ESMTP id 69595-01 for ; Mon, 6 Aug 2007 06:42:22 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from mx3.ipf.is (dodge.ipf.is [85.197.192.152]) by postgresql.org (Postfix) with ESMTP id 92FBE9FB48B for ; Mon, 6 Aug 2007 06:42:25 -0300 (ADT) Received: (qmail 21442 invoked by uid 1010); 6 Aug 2007 09:41:54 +0000 Received: from 88.149.106.19 by dodge (envelope-from , uid 1008) with qmail-scanner-1.25-st-qms (clamdscan: 0.88.4/1639. spamassassin: 3.1.4. perlscan: 1.25-st-qms. Clear:RC:1(88.149.106.19):SA:0(-2.4/4.5):. Processed in 0.86064 secs); 06 Aug 2007 09:41:54 -0000 X-Antivirus-HIVE-Mail-From: gnari@hive.is via dodge X-Antivirus-HIVE: 1.25-st-qms (Clear:RC:1(88.149.106.19):SA:0(-2.4/4.5):. Processed in 0.86064 secs Process 21435) Received: from dsl-149-106-19.hive.is (HELO ?192.168.1.33?) (88.149.106.19) by mx3.ipf.is with SMTP; 6 Aug 2007 09:41:53 +0000 Subject: Re: Performance problems with large telemetric datasets on 7.4.2 From: Ragnar To: Sven Clement Cc: pgsql-performance@postgresql.org In-Reply-To: <881035ea0708060010u1bbb4b58r57bdf6f51b12f7d9@mail.gmail.com> References: <881035ea0708030652r37b25a86g61e88e1f5e95eab2@mail.gmail.com> <1186150836.19184.194.camel@archimedes> <881035ea0708030857s621af020r4d3d7b994e2ca9a3@mail.gmail.com> <46B39A77.8050105@sprocks.gotdns.com> <4770.1186180449@sss.pgh.pa.us> <881035ea0708041303h4ea256b3q4b40c5291f8cd3b7@mail.gmail.com> <46B5F5C7.1070901@enterprisedb.com> <881035ea0708060010u1bbb4b58r57bdf6f51b12f7d9@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Date: Mon, 06 Aug 2007 09:50:25 +0000 Message-Id: <1186393825.5778.368.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.8.1 Content-Transfer-Encoding: 8bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200708/39 X-Sequence-Number: 26169 On mán, 2007-08-06 at 00:10 -0700, Sven Clement wrote: > > > 2007/8/5, Heikki Linnakangas : > > I don't remember a bug like that. Where did you read that > from? > > -- > Heikki Linnakangas > EnterpriseDB http://www.enterprisedb.com > > Partially I found that one in the PostgreSQL Documentation for the > 7.x.x versions under the command REINDEX where they claim that you > should run a reindex under certain circumstances and for my > comprehension this says that with some access pattern (as ours (major > writes / one big delete per day)) the index may be corrupted or > otherwise not really useful. you are probably talking about index bloat, not corruption. when that happens, the index consumes more space that needed, and its effectivity is reduced, but it is not corrupted and does not cause wrong results. i believe this is a lot less common now than in the 7.x days gnari