Received: from maia.hub.org (unknown [200.46.208.211]) by mail.postgresql.org (Postfix) with ESMTP id E3C97632593 for ; Sat, 20 Feb 2010 21:15:34 -0400 (AST) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.208.211]) (amavisd-maia, port 10024) with ESMTP id 18813-02 for ; Sun, 21 Feb 2010 01:15:16 +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 1AA95633C30 for ; Sat, 20 Feb 2010 21:15:23 -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 o1L1FLRX025692; Sat, 20 Feb 2010 20:15:21 -0500 (EST) To: "George Sexton" cc: pgsql-performance@postgresql.org Subject: Re: AutoVacuum_NapTime In-reply-to: <053401cab291$a8cf7250$fa6e56f0$@com> References: <053401cab291$a8cf7250$fa6e56f0$@com> Comments: In-reply-to "George Sexton" message dated "Sat, 20 Feb 2010 18:03:19 -0700" Date: Sat, 20 Feb 2010 20:15:20 -0500 Message-ID: <25691.1266714920@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-2.465 tagged_above=-10 required=5 tests=AWL=0.134, BAYES_00=-2.599 X-Spam-Level: X-Archive-Number: 201002/282 X-Sequence-Number: 37703 "George Sexton" writes: > I have a system with around 330 databases running PostgreSQL 8.4.2 > What would the expected behavior be with AutoVacuum_NapTime set to the > default of 1m and autovacuum_workers set to 3? autovacuum_naptime is the cycle time for any one database, so you'd get an autovac worker launched every 60/330 seconds ... regards, tom lane