Disk and shared buffer cache use

From: "Chamara Gunaratne" <chamarag(at)gmail(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: Disk and shared buffer cache use
Date: 2007-05-08 19:29:43
Message-ID: db0a7ed90705081229u49f3c8f8v3c1b0a5d15abd3fb@mail.gmail.com
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Hello All,
Is there a way to determine the percentage of data found in the shared
buffer cache when running a query in PostgreSQL 7.4? Or to put it in
another way, how do you measure the effectiveness of the shared buffer
cache?

I read through several sites on PostgreSQL performance tuning, but
couldn't find a method to measure this.
Thank you,

Chamara

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