Received: from maia.hub.org (maia-2.hub.org [200.46.204.251]) by mail.postgresql.org (Postfix) with ESMTP id 892D11337990 for ; Mon, 8 Nov 2010 05:13:43 -0400 (AST) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.251]) (amavisd-maia, port 10024) with ESMTP id 71232-05 for ; Mon, 8 Nov 2010 09:13:36 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from manuel.natserv.net (p65-147.acedsl.com [66.114.65.147]) by mail.postgresql.org (Postfix) with ESMTP id C0BDF1336B42 for ; Mon, 8 Nov 2010 05:13:35 -0400 (AST) Received: from shelca (zoraida.natserv.net [66.114.65.147]) by manuel.natserv.net (Postfix) with ESMTP id 39931FBDA; Mon, 8 Nov 2010 04:13:35 -0500 (EST) References: Message-ID: X-Mailer: http://www.courier-mta.org/cone/ From: Francisco Reyes To: Robert Haas Cc: Pgsql performance Subject: Re: Regression: 8.3 2 seconds -> 8.4 100+ seconds Date: Mon, 08 Nov 2010 04:13:35 -0500 Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset="US-ASCII" Content-Disposition: inline Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-0.59 tagged_above=-10 required=5 tests=BAYES_00=-1.9, RCVD_IN_RP_RNBL=1.31 X-Spam-Level: X-Archive-Number: 201011/94 X-Sequence-Number: 41118 Robert Haas writes: > This part looks really strange to me. Here we have a nested loop > whose outer side is estimated to produce 33 rows and whose outer side > is estimated to produce 2 rows. We have retained someone to help us troubleshoot the issue. Once the issue has been resolved I will make sure to post our findings.