pginfo <[EMAIL PROTECTED]> writes:
> I was supprised that the pgsql trigger take ~8 sec. to insert this rows
> and the "C" trigger take ~ 17 sec.

The reason is that plpgsql caches the plan for the invoked SELECT,
whereas the way you coded the C function, it's re-planning that SELECT
on every call.

                        regards, tom lane

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