Received: from maia.hub.org (maia-3.hub.org [200.46.204.243]) by mail.postgresql.org (Postfix) with ESMTP id E58F01337B67 for ; Wed, 10 Nov 2010 20:46:42 -0400 (AST) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.243]) (amavisd-maia, port 10024) with ESMTP id 73361-07 for ; Thu, 11 Nov 2010 00:46:35 +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 67844133616B for ; Wed, 10 Nov 2010 20:46:35 -0400 (AST) 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 oAB0kTV8029872; Wed, 10 Nov 2010 19:46:30 -0500 (EST) To: Samuel Stearns cc: "pgsql-admin@postgresql.org" Subject: Re: Transaction ID's and Vacuum In-reply-to: <68B59BEDCD36854AADBDF17E91B2937A0783A723F8@EXCHMAIL.staff.internode.com.au> References: <68B59BEDCD36854AADBDF17E91B2937A0783A723F8@EXCHMAIL.staff.internode.com.au> Comments: In-reply-to Samuel Stearns message dated "Thu, 11 Nov 2010 10:48:23 +1030" Date: Wed, 10 Nov 2010 19:46:29 -0500 Message-ID: <29871.1289436389@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: 201011/84 X-Sequence-Number: 36050 Samuel Stearns writes: > I've got an old 7.4.5 instance of Postgres running on Linux. My transaction ID's are just over the 1 billion mark. I ran an instance wide vacuum analyse but this had now effect on the transaction ID count. Do I need to run a vacuum full? No. There is no need to worry. The transaction counter will march up to 4 billion and then wrap around, if you keep the instance going that long. This is not a problem. regards, tom lane