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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Joe Conway <mail@joeconway.com>
Cc: Christopher Kings-Lynne <chris.kings-lynne@calorieking.com>
Cc: Hackers (PostgreSQL) <pgsql-hackers@postgresql.org>
Cc: Andrew Dunstan <andrew@dunslane.net>
Cc: Bernd Helmle <mailings@oopsware.de>
Cc: Peter Eisentraut <peter_e@gmx.net>
Cc: Susanne Ebrecht <susanne.ebrecht@credativ.de>
Subject: Re: [PATCHES] 8.2 features?
Date: Wed, 19 Jul 2006 23:58:07 -0400
Message-ID: <23198.1153367887@sss.pgh.pa.us> (raw)
In-Reply-To: <44BEA710.6060700@joeconway.com>
References: <44B69778.5050104@dunslane.net>
	<50461.84.63.113.55.1152832991.squirrel@pezone.net>
	<ECCAAC0A3182895D3D12B0E8@[172.26.14.247]>
	<44B7ADFC.90205@dunslane.net>
	<44BC0432.3040509@joeconway.com>
	<44BC661F.80609@joeconway.com>
	<44BCD06C.3060409@calorieking.com>
	<44BCF1D4.3010807@dunslane.net>
	<5842.1153246741@sss.pgh.pa.us>
	<44BD8854.9060506@calorieking.com>
	<15212.1153279954@sss.pgh.pa.us>
	<44BDB2F5.7080003@joeconway.com>
	<44BEA710.6060700@joeconway.com>

Joe Conway <mail@joeconway.com> writes:
> I did some testing today against mysql and found that it will easily 
> absorb insert statements with 1 million targetlists provided you set 
> max_allowed_packet high enough for the server. It peaked out at about 
> 600MB, compared to my test similar last night where it was using about 
> 3.8 GB when I killed it.

> So the question is, do we care?

What's the performance like relative to mysql?  It seems hard to believe
that we can afford the overhead of a separate INSERT statement per row
(duplicating all the work of parse analysis, rewrite, planning, executor
start/stop) ... at least not without looking mighty bad.

			regards, tom lane

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