Received: from localhost (maia-4.hub.org [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 9DC2B9FB651; Thu, 25 Jan 2007 12:02:14 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-new, port 10024) with ESMTP id 40163-09; Thu, 25 Jan 2007 12:01:53 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey-1.7.4 X-Greylist: from auto-whitelisted by SQLgrey-1.7.4 Received: from lists.commandprompt.com (host-254.commandprompt.net [207.173.203.254]) by postgresql.org (Postfix) with ESMTP id 6FD2C9FB64F; Thu, 25 Jan 2007 12:01:53 -0400 (AST) Received: from [192.168.1.50] (or-67-76-146-141.sta.embarqhsd.net [67.76.146.141]) (authenticated bits=0) by lists.commandprompt.com (8.13.7/8.13.6) with ESMTP id l0PG1dCk022635 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 25 Jan 2007 08:01:45 -0800 Message-ID: <45B8D521.8010405@commandprompt.com> Date: Thu, 25 Jan 2007 08:04:49 -0800 From: "Joshua D. Drake" Organization: Command Prompt, Inc. User-Agent: Thunderbird 1.5.0.9 (X11/20070103) MIME-Version: 1.0 To: "Jim C. Nasby" , Galy Lee , pgsql-performance@postgresql.org, Hackers Subject: Re: [HACKERS] how to plan for vacuum? References: <45B6F0A8.1050705@oss.ntt.co.jp> <20070125033917.GD64372@nasby.net> <20070125035202.GI26006@alvh.no-ip.org> In-Reply-To: <20070125035202.GI26006@alvh.no-ip.org> X-Enigmail-Version: 0.94.0.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV version 0.88.5, clamav-milter version 0.88.5 on projects.commandprompt.com X-Virus-Status: Clean X-Greylist: Sender succeded SMTP AUTH authentication, not delayed by milter-greylist-1.6 (lists.commandprompt.com [192.168.2.159]); Thu, 25 Jan 2007 08:01:45 -0800 (PST) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200701/371 X-Sequence-Number: 22972 Alvaro Herrera wrote: > Jim C. Nasby wrote: > >> I'll generally start with a cost delay of 20ms and adjust based on IO >> utilization. > > I've been considering set a default autovacuum cost delay to 10ms; does > this sound reasonable? It really depends on the system. Most of our systems run anywhere from 10-25ms. I find that any more than that, Vacuum takes too long. Joshua D. Drake -- === The PostgreSQL Company: Command Prompt, Inc. === Sales/Support: +1.503.667.4564 || 24x7/Emergency: +1.800.492.2240 Providing the most comprehensive PostgreSQL solutions since 1997 http://www.commandprompt.com/ Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate PostgreSQL Replication: http://www.commandprompt.com/products/