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Re: Shared Buffer Size

From: Derrick Rice <derrick(dot)rice(at)gmail(dot)com>
To: preetika tyagi <preetikatyagi(at)gmail(dot)com>
Cc: "pgsql-general(at)postgresql(dot)org General" <pgsql-general(at)postgresql(dot)org>
Subject: Re: Shared Buffer Size
Date: 2011-05-27 21:11:56
Message-ID: BANLkTimXs8X4ALvF4Wo2+yJGux2iO=aSZA@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-general
Check out the "Inside the PostgreSQL Buffer Cache" link here:

http://projects.2ndquadrant.com/talks

Thanks to Greg Smith (active here).

Derrick

On Fri, May 27, 2011 at 3:36 PM, preetika tyagi <preetikatyagi(at)gmail(dot)com>wrote:

> Hi All,
>
> I am little confused about the internal working of PostgreSQL. There is a
> parameter shared_buffer in postgres.conf and I am assuming that it is used
> for buffer management in PostgreSQL. If there is a need to bring in a new
> page in the buffer and size exceeds the shared_buffer limit, a victim dirty
> page will be written back to the disk.
>
> However, I have read on many links that PostgreSQL depends on the OS for
> caching. (http://www.varlena.com/GeneralBits/Tidbits/perf.html#shbuf)
>
> So my question is, the actual limit of the shared buffer will be defined by
> OS or the shared_buffer parameter in the postgres.conf to figure whether a
> victim dirty page needs to be selected for disk write or not?
>
> Thanks!
>

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