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Re: [PERFORM] Foreign key performance

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com>
Cc: Kevin Brown <kevin(at)sysexperts(dot)com>, pgsql-hackers(at)postgresql(dot)org,pgsql-performance(at)postgresql(dot)org
Subject: Re: [PERFORM] Foreign key performance
Date: 2003-04-18 06:06:04
Message-ID: 1966.1050645964@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-performance
Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> writes:
> It appears (from some not terribly scientific experiments - see below)
> that it's likely to be related to managing the deferred trigger queue
> given that in my case at least running the constraints non-deferred was
> negligible in comparison.

At one time the deferred-trigger queue had an O(N^2) behavioral problem
for large N = number of pending trigger events.  But I thought we'd
fixed that.  What's the test case exactly?  Can you get a profile with
gprof?

			regards, tom lane


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