Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 3655C37BD97 for ; Sun, 28 Sep 2008 11:33:23 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 35815-10 for ; Sun, 28 Sep 2008 11:33:21 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id EFEA637BC87 for ; Sun, 28 Sep 2008 11:33:19 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m8SEX89P006111; Sun, 28 Sep 2008 10:33:08 -0400 (EDT) To: John Huttley cc: Scott Marlowe , pgsql-performance@postgresql.org Subject: Re: Slow updates, poor IO In-reply-to: <48DEB4D4.1020100@mib-infotech.co.nz> References: <48DBE587.3050406@mib-infotech.co.nz> <20080926131556.GA1005@commandprompt.com> <48DD6A4A.10209@mib-infotech.co.nz> <48DEB4D4.1020100@mib-infotech.co.nz> Comments: In-reply-to John Huttley message dated "Sun, 28 Sep 2008 11:33:56 +1300" Date: Sun, 28 Sep 2008 10:33:08 -0400 Message-ID: <6110.1222612388@sss.pgh.pa.us> From: Tom Lane 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: 200809/242 X-Sequence-Number: 31555 John Huttley writes: > Scott Marlowe wrote: >> was... was a part of the trade-offs. > You are thinking of HOT? > I don't think it applies in the case of full table updates?? Sure, as long as there's enough free space on each page. If you wanted to make a table that was optimized for this kind of thing, you could try creating it with fillfactor 50. regards, tom lane