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From: David Wheeler <david@kineticode.com>
Subject: Re: [Dbdpg-general] [ANNOUNCE] pgtop,
	display PostgreSQL processes in `top' style
Date: Mon, 2 May 2005 16:23:29 -0700
To: Cosimo Streppone <cosimo@streppone.it>

On Apr 30, 2005, at 15:10 , Cosimo Streppone wrote:

> 1) is it possible to know Pg backend uptime with
>    SQL queries? Or must I look at postmaster.pid file?
>    or even something else?

I think that the PID file is your best bet.

> 2) how can I know the ip addresses/hostnames of clients
>    connecting to server?

I believe that that information is in pg_stat_activity. See:

   http://www.postgresql.org/docs/current/static/monitoring.html

> 3) Is there a way to know the number of queries performed
>    against Pg backend (by each client)? Can I distinguish
>    between selects / updates / inserts / copy / ... ?

I think so, but you have to enable some postgresql.conf settings to  
get that information logged.

   http://www.postgresql.org/docs/8.0/static/runtime-config.html

Regards,

David