Re: postgresql.conf

Scott,

> I'm guessing OLTP needs things like FSM cranked up,
> OLAP (a for analytical) needs more shared buffers and sort memory
> Webserver might be better served just slightly higher values than default
> but well under those of either OLTP or OLAP...

Yes. Take sort_mem for example:
OLTP_SM    1024
OLTP_LM    2048
OLAP_SM    4096
OLAP_LM    16384
WWW_SM    512
WWW_LM    1024
Workstation    1024

The basic idea is:
More RAM => more sort_mem
More concurrent queries => less sort_mem
Larger data sets => more sort_mem
Lots of grouped aggregates => more sort_mem

--
-Josh Berkus
 Aglio Database Solutions
 San Francisco