Shared memory use?

Is there a way to ask pgsql how much memory, sort memory,  etc is being
used by pgsql at a given time (like in a system table or something)?

Thanks,
- Brandon


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 c: 646-456-5455                                            h: 201-798-4983
 b. palmer,  bpalmer@crimelabs.net           pgp:crimelabs.net/bpalmer.pgp5