[EMAIL PROTECTED] writes:
> I don't know much about DBI/DBD but I know sqlgrey uses a lot of
> prepare/prepare_cached statements.

Well, those aren't exactly free.

Possibly you could learn something about it by attaching to one of
these backends with gdb and executing

        call MemoryContextStats(TopMemoryContext)

This will dump a memory map to stderr.

                        regards, tom lane

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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