Sender: hannu@kodu.home.ee
Message-ID: <377B37FC.C7B065A4@trust.ee>
Date: Thu, 01 Jul 1999 12:42:20 +0300
From: Hannu Krosing <hannu@trust.ee>
Organization: Trust-O-Matic =?iso-8859-1?Q?O=DC?=
MIME-Version: 1.0
To: Brendan McKenna <brendan@w3s.ie>
CC: pgsql-interfaces@hub.org
Subject: Re: [INTERFACES] Active users?
References: <199906301953.UAA00636@w3s.ie>
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Brendan McKenna wrote:
> 
> Hi,
> 
>         Is there a reliable way to determine how many (if any) users are
> currently using any given database (or whether or not postgres is currently
> in use) -- short of bringing down the postmaster and restarting it?

You can get the needed info using ps (or top)

The following is in linux (on other systens the flags to ps may differ):

[hannu@kodu hannu]$ ps ax | grep postgres
  604  p1 S    0:00 grep postgres
  600  ?  S    0:00 /usr/bin/postgres localhost hannu unidocu idle

the 8th field is db name, so you can probably write a short script 
(sh, awk, python, perl, ...) to do the counting.

the fields >8 is current command, so yo can check what your backends are
doing.

---------------------
Hannu