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To: Bryce Nesbitt <bryce1@obviously.com>
cc: pgsql-sql@postgresql.org
Subject: Re: Very slow DELETE on 4000 rows of 55000 row table 
In-reply-to: <4611EFE1.5010400@obviously.com> 
References: <4611EFE1.5010400@obviously.com>
Comments: In-reply-to Bryce Nesbitt <bryce1@obviously.com>
	message dated "Mon, 02 Apr 2007 23:10:41 -0700"
Date: Tue, 03 Apr 2007 03:04:00 -0400
Message-ID: <21308.1175583840@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Bryce Nesbitt <bryce1@obviously.com> writes:
> I've got a DELETE FROM that seems to run forever, pegging the CPU at
> 100%.  I can't figure out why it's slow.  Any clues?

Unindexed foreign key constraints pointing to this table, perhaps?
EXPLAIN ANALYZE would give a great deal more clue than plain EXPLAIN.

			regards, tom lane