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 E1B075292D for ; Sat, 6 Aug 2005 11:12:49 -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 78521-02 for ; Sat, 6 Aug 2005 14:12:39 +0000 (GMT) Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by svr1.postgresql.org (Postfix) with ESMTP id 26C4C52AB1 for ; Sat, 6 Aug 2005 11:12:38 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.1/8.13.1) with ESMTP id j76EChYV017917; Sat, 6 Aug 2005 10:12:43 -0400 (EDT) To: Patrick Hatcher Cc: "pgsql-performance@postgresql.org" Subject: Re: Slow update statement In-reply-to: <42F4B812.7070501@comcast.net> References: <42F4B812.7070501@comcast.net> Comments: In-reply-to Patrick Hatcher message dated "Sat, 06 Aug 2005 06:16:02 -0700" Date: Sat, 06 Aug 2005 10:12:43 -0400 Message-ID: <17916.1123337563@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.006 tagged_above=0 required=5 tests=AWL X-Spam-Level: X-Archive-Number: 200508/56 X-Sequence-Number: 13803 Patrick Hatcher writes: > I'm running an update statement on about 12 million records using the > following query: > Update table_A > set F1 = b.new_data > from table_B b > where b.keyfield = table_A.keyfield What does EXPLAIN show for this? Do you have any foreign key references to table_A from elsewhere? regards, tom lane