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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: Thu, 14 Dec 2006 11:50:26 -0500
Message-ID: <21627.1166115026@sss.pgh.pa.us> (raw)
In-Reply-To: <1166114095.27428.133.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>
	<4581593E.8080401@freesurf.fr>
	<20426.1166109494@sss.pgh.pa.us>
	<45816C54.5010602@freesurf.fr>
	<21233.1166113140@sss.pgh.pa.us>
	<1166114095.27428.133.camel@archimedes>

Mark Lewis <mark.lewis@mir3.com> writes:
> Out of curiosity, how hard would it be to modify the output of EXPLAIN
> ANALYZE when doing an insert/update to include the index update times
> and/or non-FK constraint checking times and/or the table row update
> times?

I don't think it'd help much --- in an example like this, other tools
like vmstat would be more likely to be useful in investigating the
problem.  There's also the problem that EXPLAIN ANALYZE overhead is
already too high --- another dozen gettimeofday() calls per row
processed doesn't sound appetizing.

			regards, tom lane

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