Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1ULaBH-0001gy-NA for pgsql-performance@arkaria.postgresql.org; Fri, 29 Mar 2013 14:21:23 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.72) (envelope-from ) id 1ULaBH-00040v-2V for pgsql-performance@arkaria.postgresql.org; Fri, 29 Mar 2013 14:21:23 +0000 Received: from makus.postgresql.org ([2001:4800:7903:4::125]) by malur.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1ULaBF-00040p-Ny for pgsql-performance@postgresql.org; Fri, 29 Mar 2013 14:21:22 +0000 Received: from smtp10.smtpout.orange.fr ([80.12.242.132] helo=smtp.smtpout.orange.fr) by makus.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1ULaB9-0000Sx-LZ for pgsql-performance@postgresql.org; Fri, 29 Mar 2013 14:21:20 +0000 Received: from axege.com ([82.127.232.162]) by mwinf5d45 with ME id HSMC1l00K3WtTCJ03SMCHW; Fri, 29 Mar 2013 15:21:13 +0100 Received: from localhost (localhost [127.0.0.1]) by axege.com (Postfix) with ESMTP id 383CB43DE03 for ; Fri, 29 Mar 2013 15:21:12 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at myhostname="axege.com." Received: from axege.com ([127.0.0.1]) by localhost (axege.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GWYBJjbo8qY7 for ; Fri, 29 Mar 2013 15:20:42 +0100 (CET) Received: from [10.0.0.84] (unknown [10.0.0.84]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by axege.com (Postfix) with ESMTPSA id 4A7C143DE01 for ; Fri, 29 Mar 2013 15:20:42 +0100 (CET) Message-ID: <5155A33A.4090000@axege.com> Date: Fri, 29 Mar 2013 15:20:42 +0100 From: Franck Routier User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 MIME-Version: 1.0 To: postgres performance list Subject: Postgresql performance degrading... how to diagnose the root cause Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms000403000608040009070100" X-Pg-Spam-Score: -1.1 (-) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-performance Precedence: bulk Sender: pgsql-performance-owner@postgresql.org Ceci est un message signé cryptographiquement au format MIME. --------------ms000403000608040009070100 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Hi, I have a postgresql database (8.4) running in production whose=20 performance is degrading. There is no single query that underperforms, all queries do. Another interesting point is that a generic performance test=20 (https://launchpad.net/tpc-b) gives mediocre peformance when run on the=20 database, BUT the same test on a newly created database, on the same pg=20 cluster, on the same tablespace, does perform good. So the problem seems to be limited to this database, even on newly=20 created tables... What should I check to find the culprit of this degrading performance ? 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