Received: from localhost (unknown [200.46.204.183]) by mail.postgresql.org (Postfix) with ESMTP id C5C7B64FD2B for ; Fri, 12 Dec 2008 06:07:27 -0400 (AST) Received: from mail.postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 25427-07 for ; Fri, 12 Dec 2008 06:07:21 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from a.mail.sonomait.com (a.mail.sonomait.com [64.142.123.30]) by mail.postgresql.org (Postfix) with ESMTP id BC3D864FCF9 for ; Fri, 12 Dec 2008 06:07:20 -0400 (AST) Received: from localhost (localhost.localdomain [127.0.0.1]) by a.mail.sonomait.com (Postfix) with ESMTP id BD108164760 for ; Fri, 12 Dec 2008 02:07:15 -0800 (PST) X-Virus-Scanned: amavisd-new at Received: from a.mail.sonomait.com ([127.0.0.1]) by localhost (a.mail.sonomait.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8s3WC94JTxie for ; Fri, 12 Dec 2008 02:07:14 -0800 (PST) Received: from [172.18.30.70] (89-96-142-243.ip12.fastwebnet.it [89.96.142.243]) by a.mail.sonomait.com (Postfix) with ESMTP id 72C72164714 for ; Fri, 12 Dec 2008 02:07:13 -0800 (PST) Message-ID: <494237CC.8020001@gmail.com> Date: Fri, 12 Dec 2008 11:07:08 +0100 From: Stefano Nichele User-Agent: Thunderbird 2.0.0.18 (Windows/20081105) MIME-Version: 1.0 To: pgsql-performance@postgresql.org Subject: db server load Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200812/140 X-Sequence-Number: 32176 Hi All, I would like to ask to you, how many connections a db server can handle. I know the question is not so easy, and actually I don't want to known a "number" but something like: - up to 100 connections: small load, low entry server is enough - up to 200 connections: the db server starts to sweat, you need a dedicated medium server - up to 300 connections: hard work, dedicated server - up to 500 connections: hard work, dedicated high level server I would like just to understand when we can talk about small/medium/high load. At the moment I'm using a quad-proc system with a 6 disk 1+0 RAID array and 2 separate disks for the OS and write-ahead logs. Thanks ste