X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id 26A9F52831 for ; Mon, 18 Jul 2005 02:09:28 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 83890-09 for ; Mon, 18 Jul 2005 05:09:20 +0000 (GMT) Received: from rambo.iniquinet.com (rambo.iniquinet.com [69.39.89.10]) by svr1.postgresql.org (Postfix) with ESMTP id 09D0252AFA for ; Mon, 18 Jul 2005 02:09:19 -0300 (ADT) Received: (qmail 32175 invoked by uid 1010); 18 Jul 2005 01:09:20 -0400 Received: from Robert_Creager@LogicalChaos.org by rambo.iniquinet.com by uid 1002 with qmail-scanner-1.20 (clamscan: 0.70. spamassassin: 3.0.3. Clear:RC:0(63.147.78.131):SA:0(?/?):. Processed in 1.110409 secs); 18 Jul 2005 05:09:20 -0000 Received: from unknown (HELO thunder.logicalchaos.org) (perl?test@logicalchaos.org@63.147.78.131) by rambo.iniquinet.com with AES256-SHA encrypted SMTP; 18 Jul 2005 01:09:18 -0400 Received: from logicalchaos.org (thunder.logicalchaos.org [192.168.0.250]) by thunder.logicalchaos.org (Postfix) with ESMTP id 9B4DA311CE; Sun, 17 Jul 2005 23:09:12 -0600 (MDT) Date: Sun, 17 Jul 2005 23:09:12 -0600 From: Robert Creager To: Tom Lane Cc: PGPerformance , Andy Hewitt Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS Message-ID: <20050717230912.12d51ec9@thunder.logicalchaos.org> In-Reply-To: <24520.1121659853@sss.pgh.pa.us> References: <20050717213416.59dcb52e@thunder.logicalchaos.org> <24520.1121659853@sss.pgh.pa.us> Organization: Starlight Vision, LLC. X-Mailer: Sylpheed-Claws 1.0.3 (GTK+ 1.2.10; i586-mandrake-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; boundary=Signature_Sun__17_Jul_2005_23_09_12_-0600_Rpg7oL+V5OnpZbJ.; protocol="application/pgp-signature"; micalg=pgp-sha1 X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.002 tagged_above=0 required=5 tests=AWL X-Spam-Level: X-Archive-Number: 200507/250 X-Sequence-Number: 13491 --Signature_Sun__17_Jul_2005_23_09_12_-0600_Rpg7oL+V5OnpZbJ. Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable When grilled further on (Mon, 18 Jul 2005 00:10:53 -0400), Tom Lane confessed: > Have you tried reverting > to the cron-based vacuuming method you used in 7.4? >=20 I just stopped autovacuum, ran a manual vacuum analyze on 803 (2064 pages needed, 8000000 FSM setting) and re-started the run (with cron vac enabled)= .=20 The query problem has not showed up yet (1/2 hour). A vacuum on 741 showed= 3434 pages needed, 200000 FSM setting. I'll let it run the night and see if it shows up after a couple of hours. = It has run clean for 1 hour prior. If this runs 'till morning, I'll re-enable= the autovacuum, disable the cron and see if it reproduces itself (the slowdown). Cheers, Rob --=20 22:18:40 up 4 days, 1:53, 8 users, load average: 0.10, 0.20, 0.14 Linux 2.6.5-02 #8 SMP Mon Jul 12 21:34:44 MDT 2004 --Signature_Sun__17_Jul_2005_23_09_12_-0600_Rpg7oL+V5OnpZbJ. Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iEYEARECAAYFAkLbOXgACgkQLQ/DKuwDYznSGwCbBWYsuWu4EBxxx8LU2GWY0t4T T9YAnRhBjfYSAVvq3RkaR7jQWnWpyU5J =VwCW -----END PGP SIGNATURE----- --Signature_Sun__17_Jul_2005_23_09_12_-0600_Rpg7oL+V5OnpZbJ.--