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Re: pgsql: Document random page cost is only 4x seqeuntial, and not 40x.

From: Thom Brown <thom(at)linux(dot)com>
To: Bruce Momjian <bruce(at)momjian(dot)us>
Cc: pgsql-committers(at)postgresql(dot)org
Subject: Re: pgsql: Document random page cost is only 4x seqeuntial, and not 40x.
Date: 2012-02-14 22:44:08
Message-ID: CAA-aLv7nHHFB5nTgSMyRdJ_djDGk7exnEn+uEScT=obYpU6Z5A@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-committers
On 14 February 2012 21:55, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> Document random page cost is only 4x seqeuntial, and not 40x.
>
> Branch
> ------
> master
>
> Details
> -------
> http://git.postgresql.org/pg/commitdiff/c1d9df4fa227781b31be44a5a3024865a7f48049
>
> Modified Files
> --------------
> doc/src/sgml/config.sgml |   20 ++++++++++++++++++++
> 1 files changed, 20 insertions(+), 0 deletions(-)

This change does say that it is 40 times slower:

"The default value can be thought of as modeling random access as 40
times slower than sequential..."

-- 
Thom

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