Thread: Contexts

I'm about to launch into an experiment that will do some new things
inside the PG server.  I'm sure to have a lot of problems, and one
of them I can already tell is going to be difficult is the business
of contexts: memory contexts, scan contexts and the like.

Before I go around shooting myself in the foot, I would like to
educate myself about how they work inside the current code.  Does
anyone know where best to look?  It can be the code, better if it's
a document.  I'm happy to RTFM or RTFC, but I'd like to know where
to start.

++ kevin


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"Kevin O'Gorman" <kogorman@pacbell.net> writes:
> I'm about to launch into an experiment that will do some new things
> inside the PG server.  I'm sure to have a lot of problems, and one
> of them I can already tell is going to be difficult is the business
> of contexts: memory contexts, scan contexts and the like.

There is some doco about memory contexts in
src/backend/utils/mmgr/README.  Dunno about anything comparable
for scan handles --- best way to deal with table scans is probably
to find a routine that does something like what you need to do,
and crib the code.
        regards, tom lane