Simon,
> SIGHUP - seems to allow different parameter settings in each backend
Nope. SIGHUP means that you need to send a HUP to the postmaster, such as
you would with changes to pg_hba.conf.
> SUSET - maybe what you're looking for???????
Yes. This means that it can be changed, at runtime, but by the Superuser
only. This is used for several settings which are possible to change at
runtime but take effect system-wide.
--
-Josh Berkus
Aglio Database Solutions
San Francisco