Received: from localhost (unknown [200.46.204.191]) by postgresql.org (Postfix) with ESMTP id E61332E0081 for ; Fri, 18 Jan 2008 11:36:13 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.191]) (amavisd-maia, port 10024) with ESMTP id 77962-07-4 for ; Fri, 18 Jan 2008 11:36:09 -0400 (AST) Received: from wa-out-1112.google.com (wa-out-1112.google.com [209.85.146.177]) by postgresql.org (Postfix) with ESMTP id 2DD7F2E00F0 for ; Fri, 18 Jan 2008 11:36:10 -0400 (AST) Received: by wa-out-1112.google.com with SMTP id m38so1934522waf.5 for ; Fri, 18 Jan 2008 07:36:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=7prfe1V+kY4vJgTvzTKwhEq+WuRU4zIfWvT1Mze1OXY=; b=hotaGUrvYQNPxJ937vJfgADfP9kpccfn6uFr+hBMxLK6xAZmcRs3DWA22moC9cBjYDlZUQno4yK+oASS9W2/hkp7+hUEMLiounBCBn6/Tjwjq3AcVyrT9Q5vr1dMgSMkoWimws00AaFIlY7FYUJogbwzLNqy7zeax2nNnxEDe6s= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=dqEJN5FyPGKOFWwQ5I8xUSR2TrAM1L5t4TVLfsV10pfmEhMC00YyYg3bdXR2Bqdkk3KIkGpMZORNKg3Or9z+8qxbZiM6koYA26D9JDix/nJQLUAVXtEd1Sc+9ZhIcFhbYvA4GMiDGuwVuEh1+UkNTkG/36ZFUnMzmn9i+uPYc2E= Received: by 10.114.168.1 with SMTP id q1mr1517409wae.74.1200670568344; Fri, 18 Jan 2008 07:36:08 -0800 (PST) Received: by 10.114.133.5 with HTTP; Fri, 18 Jan 2008 07:36:08 -0800 (PST) Message-ID: Date: Fri, 18 Jan 2008 09:36:08 -0600 From: "Scott Marlowe" To: "Adrian Moisey" Subject: Re: strange pauses Cc: pgsql-performance@postgresql.org In-Reply-To: <4790863E.4000309@careerjunction.co.za> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <478DDF83.8070106@careerjunction.co.za> <478DE16F.50308@archonet.com> <4790863E.4000309@careerjunction.co.za> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200801/147 X-Sequence-Number: 28386 On Jan 18, 2008 4:58 AM, Adrian Moisey wrote: > > We use a lot of checkpoints in our database, we don't care about these > much. We think this is causing the checkpoint to write a lot of data at > checkpoint time. Can we stop this behavior ? You can smooth out the checkpoint behaviour by using that link I posted earlier to tune your bgwriter to write things out ahead of when the checkpoint will occurr.