Re: Server load statistics

On Sun, Jul 25, 2010 at 12:15:06PM +0200, Torsten Bronger wrote:
> I need statistics about the PG server load.  At the moment, I use
> for this
>
> SELECT tup_returned + tup_fetched + tup_inserted + tup_updated +
>      tup_deleted FROM pg_stat_database WHERE datname='mydb';
>
> However, the figures are absurdly high (> 100.000 rows per second).
> If a "row" is one dataset (one user account, one blog entry, one
> comment etc), I expect two or three orders of magnitude less.  Is my
> SQL statement nevertheless a good way to measure how busy the server
> is?

Yes, but I don't think it's measuring what you think it is.
"tup_returned" gives the number of tuples read during sequential scans,
so you've probably got some queries that are touching many more rows
than you're expecting.

--
  Sam  http://samason.me.uk/