X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 9FE509FB1A5 for ; Thu, 11 May 2006 19:41:18 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 99694-07 for ; Thu, 11 May 2006 19:41:14 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from noel.decibel.org (noel.decibel.org [67.100.216.10]) by postgresql.org (Postfix) with ESMTP id 3B9559FADD1 for ; Thu, 11 May 2006 19:41:14 -0300 (ADT) Received: by noel.decibel.org (Postfix, from userid 1001) id F16EA56435; Thu, 11 May 2006 17:41:12 -0500 (CDT) Received: (hashcash-sendmail, from uid 1001); Thu, 11 May 2006 17:41:12 -0500 Date: Thu, 11 May 2006 17:41:12 -0500 From: "Jim C. Nasby" To: Dave Dutcher Cc: 'Clemens Eisserer' , pgsql-performance@postgresql.org Subject: Re: Question about explain-command... Message-ID: <20060511224111.GX99570@pervasive.com> References: <194f62550605100449p2d200fc3pfe501da895cfcc00@mail.gmail.com> <01a901c67440$9cf097e0$8300a8c0@tridecap.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <01a901c67440$9cf097e0$8300a8c0@tridecap.com> X-Operating-System: FreeBSD 6.0-RELEASE-p4 amd64 X-Distributed: Join the Effort! http://www.distributed.net User-Agent: Mutt/1.5.11 X-Hashcash: 1:20:060511:dave@tridecap.com::gHNSdTHJz/4Gb3Dc:00000000000000000000 0000000000000000000000001fp3 X-Hashcash: 1:20:060511:linuxhippy@gmail.com::llzGLtMuap2hyn9P:00000000000000000 0000000000000000000000003/WS X-Hashcash: 1:20:060511:pgsql-performance@postgresql.org::LLB5TIS3qzdMq3nq:00000 0000000000000000000000002ASW X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200605/309 X-Sequence-Number: 19096 On Wed, May 10, 2006 at 09:47:07AM -0500, Dave Dutcher wrote: > The hash lines mean your tables are being joined by hash joins. You > should read this page for more info: > > http://www.postgresql.org/docs/8.1/interactive/performance-tips.html You might also want to read http://www.pervasivepostgres.com/instantkb13/article.aspx?id=10120&query=explain -- Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461