pg_buffercache's usage count

From: Ben Chobot <bench(at)silentmedia(dot)com>
To: pgsql-general General <pgsql-general(at)postgresql(dot)org>
Subject: pg_buffercache's usage count
Date: 2010-02-23 22:06:51
Message-ID: 2BC001D1-6BEE-4284-86EB-DE5BE12F716A@silentmedia.com
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I'm looking at the usage count column of pg_buffercache's info, and I'm confused. Several buffers that supposed have LRU values of 5 belong to non-unique indices which supposedly have never been used. As I understand things, that shouldn't happen. Am I missing something?

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