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Re: Delete query takes exorbitant amount of time

From: Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Mark Lewis <mark(dot)lewis(at)mir3(dot)com>,pgsql-performance(at)postgresql(dot)org
Subject: Re: Delete query takes exorbitant amount of time
Date: 2005-03-25 05:38:33
Message-ID: Pine.GSO.4.62.0503250837140.17555@ra.sai.msu.su (view raw or flat)
Thread:
Lists: pgsql-performance
On Thu, 24 Mar 2005, Tom Lane wrote:

> Mark Lewis <mark(dot)lewis(at)mir3(dot)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)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83

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