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From: Simon Riggs <simon@2ndquadrant.com>
To: Richard Huxton <dev@archonet.com>
Cc: Dimitri Fontaine <dfontaine@hi-media.com>
Cc: pgsql-performance@postgresql.org, "Jignesh K. Shah" <J.K.Shah@sun.com>
Cc: Greg Smith <gsmith@gregsmith.com>
Subject: Re: Benchmark Data requested
Date: Tue, 05 Feb 2008 15:26:47 +0000
Message-ID: <1202225207.4252.718.camel@ebony.site> (raw)
In-Reply-To: <47A87B2E.7050205@archonet.com>
References: <1202150236.4252.521.camel@ebony.site>
	<Pine.GSO.4.64.0802041500460.799@westnet.com>
	<47A797E5.4000507@sun.com>
	<200802051506.51581.dfontaine@hi-media.com>
	<1202221496.4252.680.camel@ebony.site>
	<47A87618.1090203@archonet.com>
	<1202223268.4252.707.camel@ebony.site>
	<47A87B2E.7050205@archonet.com>

On Tue, 2008-02-05 at 15:05 +0000, Richard Huxton wrote:

> > Only by locking the table, which serializes access, which then slows you
> > down or at least restricts other options. Plus if you use pg_loader then
> > you'll find only the first few rows optimized and all the rest not.
> 
> Hmm - the table-locking requirement is true enough, but why would 
> pg_loader cause problems after the first few rows?

It runs a stream of COPY statements, so only first would be optimized
with the "empty table optimization".

-- 
  Simon Riggs
  2ndQuadrant  http://www.2ndQuadrant.com 




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