Josh Berkus writes:
> Can I aassume that any setting documented under "3.4. Run-time Configuration"
> is a GUC variable
Yes, although "GUC" is not an official term that is defined anywhere.
> modifiable through a SET statement?
No, some of them say that they can only be set at server start.  But you
can run SHOW on all of them.
-- 
Peter Eisentraut   peter_e@gmx.net