Received: from localhost (unknown [200.46.204.182]) by postgresql.org (Postfix) with ESMTP id 9F7352E0257 for ; Wed, 23 Jan 2008 08:42:16 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.182]) (amavisd-maia, port 10024) with ESMTP id 93955-04-7 for ; Wed, 23 Jan 2008 08:42:05 -0400 (AST) Received: from wa-out-1112.google.com (wa-out-1112.google.com [209.85.146.178]) by postgresql.org (Postfix) with ESMTP id 45A3D2E033C for ; Wed, 23 Jan 2008 08:36:46 -0400 (AST) Received: by wa-out-1112.google.com with SMTP id m38so5325049waf.5 for ; Wed, 23 Jan 2008 04:36:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; bh=iIuBHySNuIoC/s77QokSaI6qliewSPcw32ZL6nin14c=; b=JFo1hqfwntVuvOE3qAZK/0fFT/Z59UHKUBoZkxh7BPTZPJV6wxpoCFB650bV52kVHyIldRaaxICEmx41mNBnny7xVMVC09wxZJR92sJMf5DjJhF2Pbguqfpijneo/ShR1lEqhwjAAslY4y3XVWZ+TIgCkzE2Tv8nfg0gCy6w3vo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; b=IIKNdaEqt4E7GMr2fHQ5G5OivefgXFR8RTKNNJHu8PGwumwK/X44o78wz1MmvRPpD8knsxeKIkUgAeI9IJd9sL+cnFTceNjwqpV9psszR5Q4DnunGzHq8z8IlQa6nntGdx0FqDJLe56G1e80+g9eQlYpWcl/2lQQqIVrbndaYd4= Received: by 10.114.201.1 with SMTP id y1mr8329014waf.121.1201091804859; Wed, 23 Jan 2008 04:36:44 -0800 (PST) Received: by 10.114.155.9 with HTTP; Wed, 23 Jan 2008 04:36:44 -0800 (PST) Message-ID: <1d4e0c10801230436o7165a7fap760b36a5ff9ef0e8@mail.gmail.com> Date: Wed, 23 Jan 2008 13:36:44 +0100 From: "Guillaume Smet" To: "Tom Lane" Subject: *_cost recommendation with 8.3 and a fully cached db Cc: pgsql-performance@postgresql.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200801/191 X-Sequence-Number: 28430 Hi Tom, On May 9, 2007 6:40 PM, Tom Lane wrote: > To return to your original comment: if you're trying to model a > situation with a fully cached database, I think it's sensible > to set random_page_cost = seq_page_cost = 0.1 or so. Is it still valid for 8.3 or is there any reason to change this recommendation, considering the work you did on the planner during the 8.3 cycle? Thanks. -- Guillaume