Received: from maia.hub.org (maia-5.hub.org [200.46.204.29]) by mail.postgresql.org (Postfix) with ESMTP id 39A461337B83 for ; Tue, 12 Oct 2010 16:33:54 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.29]) (amavisd-maia, port 10024) with ESMTP id 58323-03-2 for ; Tue, 12 Oct 2010 19:33:46 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by mail.postgresql.org (Postfix) with ESMTP id 984F61337BE9 for ; Tue, 12 Oct 2010 16:33:45 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id o9CJXiXL005084; Tue, 12 Oct 2010 15:33:44 -0400 (EDT) To: Jon Nelson cc: pgsql-performance@postgresql.org Subject: Re: read only transactions In-reply-to: References: Comments: In-reply-to Jon Nelson message dated "Tue, 12 Oct 2010 12:24:47 -0500" Date: Tue, 12 Oct 2010 15:33:44 -0400 Message-ID: <5083.1286912024@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.91 tagged_above=-10 required=5 tests=BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01 X-Spam-Level: X-Archive-Number: 201010/177 X-Sequence-Number: 40596 Jon Nelson writes: > Are there any performance implications (benefits) to executing queries > in a transaction where > SET TRANSACTION READ ONLY; > has been executed? No. regards, tom lane