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: eea51fdb0709251302x3e4deb43tbdf255895059e5ab@mail.gmail.com
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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?

Thanks.

David

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