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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Mark Lewis <mark.lewis@mir3.com>
Cc: Arnaud Lesauvage <thewild@freesurf.fr>
Cc: Ragnar <gnari@hive.is>
Cc: Jens Schipkowski <jens.schipkowski@apus.co.at>
Cc: pgsql-performance@postgresql.org
Subject: Re: Slow update with simple query
Date: Wed, 13 Dec 2006 13:47:16 -0500
Message-ID: <10219.1166035636@sss.pgh.pa.us> (raw)
In-Reply-To: <1166032273.27428.98.camel@archimedes>
References: <457FDB1E.6040801@freesurf.fr>
	<op.tkhy4jpg81rjf6@xjens.apus.local>
	<457FF0CD.4050606@freesurf.fr>
	<op.tkh10qgw81rjf6@xjens.apus.local>
	<4580025D.2040903@freesurf.fr>
	<1166021340.6369.103.camel@localhost.localdomain>
	<45801A1B.6070200@freesurf.fr>
	<8399.1166028385@sss.pgh.pa.us>
	<1166032273.27428.98.camel@archimedes>

Mark Lewis <mark.lewis@mir3.com> writes:
> But he's using 8.1.4-- in that version, an explain analyze would list
> the time taken to go through triggers, so the fact that we don't see any
> of those lines means that it can't be constraint checking, so wouldn't
> it have to be the index update overhead?

Well, it can't be foreign key checking.  Could have been an expensive
function in a CHECK constraint, maybe...

			regards, tom lane



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