su postgres in logs

[cbbrowne-HInyCGIudOg at public.gmane.org]

> I have the postgres server installed and not configured.
> One of many such messed up servers.
> 
> I'm reading the auth logs and there is a
> su[239]: + console root-postgres line.
> Is this a normal system login from a cron job or something?
> It wasn't me doing this su command.
> I guess this info might be in the
> Postgres Administrator's guide but
> I can't get around to that for some time to come.
> 
> There are several lines of  "session opened for user postgres" as well.
> Why is this? Can it just be the server starting up?

No, it's probably that your distribution has some cron jobs set up to do
maintenance.

Commonly, there will be a cron job to do a daily VACUUM on the database,
and perhaps a weekly VACUUM FULL as well.
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