Received: from maia.hub.org (maia-3.hub.org [200.46.204.243]) by mail.postgresql.org (Postfix) with ESMTP id 0F5561337B68 for ; Thu, 3 Mar 2011 01:20:37 -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 89097-06 for ; Thu, 3 Mar 2011 05:20:29 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from spinlock.commandprompt.com (host-215.commandprompt.net [207.173.203.215]) by mail.postgresql.org (Postfix) with ESMTP id A38F0133616B for ; Thu, 3 Mar 2011 01:20:28 -0400 (AST) Received: from localhost (localhost [127.0.0.1]) by spinlock.commandprompt.com (Postfix) with ESMTP id 2B25734804A; Wed, 2 Mar 2011 21:20:28 -0800 (PST) X-Virus-Scanned: Debian amavisd-new at commandprompt.com Received: from spinlock.commandprompt.com ([127.0.0.1]) by localhost (spinlock.commandprompt.com.commandprompt.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ApixipTGS4SO; Wed, 2 Mar 2011 21:20:26 -0800 (PST) Received: from [192.168.1.137] (71-94-248-62.dhcp.mdfd.or.charter.com [71.94.248.62]) by spinlock.commandprompt.com (Postfix) with ESMTPSA id EC412348046; Wed, 2 Mar 2011 21:20:25 -0800 (PST) Subject: Re: Performance Test for PostgreSQL9 From: "Joshua D. Drake" Reply-To: jd@commandprompt.com To: Selva manickaraja Cc: Greg Smith , Robert Haas , pgsql-performance@postgresql.org In-Reply-To: References: <1299090595.25659.135.camel@jd-desktop> <4D6F12A1.5050903@2ndquadrant.com> Content-Type: text/plain; charset="UTF-8" Organization: Command Prompt, Inc. Date: Wed, 02 Mar 2011 21:20:24 -0800 Message-ID: <1299129624.16115.56.camel@jd-desktop> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.9 tagged_above=-10 required=5 tests=BAYES_00=-1.9 X-Spam-Level: X-Archive-Number: 201103/32 X-Sequence-Number: 42711 On Thu, 2011-03-03 at 13:16 +0800, Selva manickaraja wrote: > Thanks for the enlightenment. I will then look into other tools that > help > with performance testing. Is pgbench really useful? We need to produce > the > reports and statistics to our management as we are planning to migrate > one > system at a time from Informix. This is to ensure that we do not > overload > the database with all the systems eventually. So can pgbench help us > here? If you have an existing system, you best bet is to migrate your schema and a data snapshot from that system to PostgreSQL. Then take a portion of your more expensive queries and port them to PostgreSQL and compare from there. A vanilla PgBench or other workload manager will do nothing to help you with a real world metric to provide to those that wear ties. JD -- PostgreSQL.org Major Contributor Command Prompt, Inc: http://www.commandprompt.com/ - 509.416.6579 Consulting, Training, Support, Custom Development, Engineering http://twitter.com/cmdpromptinc | http://identi.ca/commandprompt