Re: Delete query takes exorbitant amount of time

Mark Lewis <mark.lewis@mir3.com> writes:
> I've got a similar problem with deletes taking a very long time.  I know
> that there are lots of foreign keys referencing this table, and other
> foreign keys referencing those tables, etc.  I've been curious, is there
> a way to find out how long the foreign key checks take for each
> dependent table?

There is not any easy way at the moment.

Hmm ... I wonder how hard it would be to teach EXPLAIN ANALYZE to show
the runtime expended in each trigger when the statement is of a kind
that has triggers.  We couldn't break down the time *within* the
triggers, but even this info would help a lot in terms of finger
pointing ...

    Seq Scan on ... (nn.nnn ms)
    Trigger foo: nn.mmm ms
    Trigger bar: nn.mmm ms
    Total time: nn.mmm ms

            regards, tom lane