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

In response to

• pgtop, display PostgreSQL processes in `top' style at 2005-04-30 22:10:30 from Cosimo Streppone

pgsql-announce by date

Next:	From: Tatsuo Ishii	Date: 2005-05-03 03:08:58
	Subject: Re: [ANNOUNCE] IMPORTANT: two new PostgreSQL security problems
Previous:	From: Markus Schaber	Date: 2005-05-02 22:09:56
	Subject: Re: [ANNOUNCE] pgtop, display PostgreSQL processes in `top' style

pgsql-sql by date

Next:	From: ogjunk-pgjedan	Date: 2005-05-03 04:35:31
	Subject: Trimming the cost of ORDER BY in a simple query
Previous:	From: Markus Schaber	Date: 2005-05-02 22:09:56
	Subject: Re: [ANNOUNCE] pgtop, display PostgreSQL processes in `top' style