From: | "Craig A(dot) James" <cjames(at)modgraph-usa(dot)com> |
---|---|
To: | Dan Harris <fbsd(at)drivefaster(dot)net> |
Cc: | PostgreSQL Performance <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: Determining server load from client |
Date: | 2007-03-21 01:15:51 |
Message-ID: | 46008747.30206@modgraph-usa.com |
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Thread: | |
Lists: | pgsql-performance |
Dan Harris wrote:
> I've found that it would be helpful to be able to tell how busy my
> dedicated PG server is ...
>
> I have seen some other nice back-end things exposed through PG functions
> ( e.g. database size on disk ) and wondered if there was anything
> applicable to this.
I'd write a simple pg-perl function to do this. You can access operating-system calls to find out the system's load. But notice that you need "Untrusted Perl" to do this, so you can only do it on a system where you trust every application that connects to your database. Something like this:
create or replace function get_stats()
returns text as '
open(STAT, "</proc/stat");
my @stats = <STAT>;
close STAT;
return join("", @stats);
' language plperlu;
See http://www.postgresql.org/docs/8.1/interactive/plperl-trusted.html
Craig
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