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Long count(*) time

From: "David Monarchi" <david(dot)e(dot)monarchi(at)gmail(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: Long count(*) time
Date: 2007-09-25 20:02:49
Message-ID: (view raw or whole thread)
Lists: pgsql-novice
Hello -

I'm running PG 8.2 on an 8-processor 16G Unix machine.  The machine is
dedicated to the db, and only 5 threads/processors are busy.  The following
query takes 70 seconds to execute.
     select count(*) from url_list_url;
There are 64,219,173 rows in the table.  The table consists of an integer
field and a text field.  The average length of the text field is 50
characters.  There are btree indexes on both fields.  The integer field is
the key.

70 seconds seems to be a long time for this kind of query.  Is this normal?




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