> I'll have to get back to you on that, but I'm 90% sure its the default out
> of the box.

Raise it, a lot.   Perhaps to 30,000 or 50,000.   VACUUM VERBOSE ANALYZE 
should show you how many data pages are being reclaimed between vacuums.

Because of your very high rate of updates and deletes, you need to hold a lot 
of data pages open.

You would also benefit a great deal by upgrading to 7.4.   7.3 will require 
you to to REINDEXes several times a day with your current setup; 7.4 will 

-Josh Berkus
 Aglio Database Solutions
 San Francisco

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TIP 8: explain analyze is your friend

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