From: Pierre C <lists@peufeu.com>
To: pgsql-performance@postgresql.org, "Willy-Bas Loos" <willybas@gmail.com>
Subject: Re: turn off caching for performance test
Date: Thu, 26 Aug 2010 19:37:21 +0200
Message-ID: <op.vh128jb5eorkce@apollo13> (raw)
In-Reply-To: <AANLkTi=dBXkp2qMHZOR_gd9eD+cjwMqOwg-N6POGq+ji@mail.gmail.com>
References: <AANLkTi=dBXkp2qMHZOR_gd9eD+cjwMqOwg-N6POGq+ji@mail.gmail.com>
> The bitmap heap scan is 3% faster,
3% isn't really significant. Especially if the new setting makes one query
100 times slower... Like a query which will, by bad luck, get turned into
a nested loop index scan for a lot of rows, on a huge table which isn't in
cache...
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To: pgsql-performance@postgresql.org
Cc: lists@peufeu.com, willybas@gmail.com
Subject: Re: turn off caching for performance test
In-Reply-To: <op.vh128jb5eorkce@apollo13>
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