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

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