Clarification Needed: When does autovacuum daemon run?

From: "Narasimha Murthy-VRFX87" <VRFX87(at)motorola(dot)com>
To: <pgsql-admin(at)postgresql(dot)org>
Subject: Clarification Needed: When does autovacuum daemon run?
Date: 2010-05-18 09:56:26
Message-ID: 58FEF525AF1E664D9503ACDEAC926BBC03BE7D7A@ZMY16EXM66.ds.mot.com
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Hello,

Postgresql-8.2 manual has mentioned following points.
* The autovacuum daemon, when enabled, runs every autovacuum_naptime
seconds.
* autovacuum_naptime (integer): Specifies the delay between "activity
rounds" for the autovacuum daemon....The delay is measured in seconds,
and the default is one minute (1m)....

My Query: I want to run autovacuum daemon everyday at 5 am. By setting
autovacuum_naptime to 24*60*60 (# of seconds in a day), I can run the
daemon everyday. But, how do I ensure the daemon runs at 5am? What is
the "activity rounds" mentioned in the manual? Pl clarify. Appreciate an
early reply.

[postgresql-8.2-US.pdf]
http://www.postgresql.org/files/documentation/pdf/8.2/postgresql-8.2-US.
pdf
<http://www.postgresql.org/files/documentation/pdf/8.2/postgresql-8.2-US
.pdf>

Regards, Narasimha Murthy
Cell +91 95814 98895, +91-94940 62794 | 040-2347 2025 (O) | x2025 (O)

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