X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id 903889DC9C9 for ; Tue, 27 Dec 2005 14:56:52 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 71126-01 for ; Tue, 27 Dec 2005 14:56:51 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from frank.wiles.org (frank.wiles.org [24.124.39.75]) by postgresql.org (Postfix) with ESMTP id BA38E9DC81A for ; Tue, 27 Dec 2005 14:56:49 -0400 (AST) Received: from kungfu (frank.wiles.org [127.0.0.1]) by frank.wiles.org (8.13.1/8.13.1) with SMTP id jBRIumMZ004565; Tue, 27 Dec 2005 12:56:48 -0600 Date: Tue, 27 Dec 2005 12:56:56 -0600 From: Frank Wiles To: Albert Cervera Areny Cc: pgsql-performance@postgresql.org Subject: Re: Performance problems with 8.1.1 compared to 7.4.7 Message-Id: <20051227125656.5d138645.frank@wiles.org> In-Reply-To: <200512271902.18023.albert@sedifa.com> References: <200512271709.29185.albert@sedifa.com> <20051227171343.GA70061@winnie.fuhr.org> <200512271902.18023.albert@sedifa.com> X-Mailer: Sylpheed version 2.0.1 (GTK+ 2.6.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.024 required=5 tests=[AWL=0.024] X-Spam-Score: 0.024 X-Spam-Level: X-Archive-Number: 200512/636 X-Sequence-Number: 16457 On Tue, 27 Dec 2005 19:02:17 +0100 Albert Cervera Areny wrote: > Are there any "rules of thumb" to let a begginer give reasonable > values to these parameters? Not only work_mem, but also > random_page_cost, and so on. Are there any tests one can run to > determine "good" values? > Hi Albert, There are several online sites that have information related to tuning parameters. Here is a list of a few of them: http://revsys.com/writings/postgresql-performance.html http://www.varlena.com/varlena/GeneralBits/Tidbits/perf.html http://www.powerpostgresql.com/Docs http://www.powerpostgresql.com/PerfList Hope these help! --------------------------------- Frank Wiles http://www.wiles.org ---------------------------------