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Re: statement_timeout is not cancelling query

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Greg Stark <gsstark(at)mit(dot)edu>, Craig Ringer <craig(at)postnewspapers(dot)com(dot)au>, Mark Williamson <thetazzbot(at)gmail(dot)com>, pgsql-bugs(at)postgresql(dot)org
Subject: Re: statement_timeout is not cancelling query
Date: 2009-12-15 20:30:24
Message-ID: 603c8f070912151230t2c90fdecp6aa8a45a0c3c69b@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-bugs
On Tue, Dec 15, 2009 at 1:33 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Tue, Dec 15, 2009 at 1:23 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
>>>> If we're to do anything about this, it is spilling the trigger queue so
>>>> it doesn't eat an unbounded amount of memory.
>>>
>>> Of course, the reason nothing much has been done about that is that
>>> by the time your trigger queue is long enough to cause such an issue,
>>> you're screwed anyway --- actually executing all those triggers would
>>> take longer than you'll want to wait.
>
>> What is the best way to go about doing that, anyway?
>
> Well, we added conditional triggers which provides a partial fix.  The
> only other idea I've heard that sounds like it'd really help is having
> some sort of lossy storage for foreign-key triggers, where we'd fall
> back to per-block or whole-table rechecking of the constraint instead of
> trying to track the exact rows that were modified.  Not sure how you
> apply that to non-FK triggers though.

Err, sorry, I quoted the wrong part.  I meant, how would you rlimit
the server memory usage?

...Robert

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