Re: Delete query takes exorbitant amount of time

On Thu, 24 Mar 2005, Tom Lane wrote:

> 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

and if you add

         Index foo_idx: nn.mm ss
     Heap  foo_tbl: nn.mm ss


>
>             regards, tom lane
>
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     Regards,
         Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
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