Re: Deadlocks caused by referential integrity checks

Tom Lane wrote:
> Greg Stark <gsstark@mit.edu> writes:
> > At least some versions of postgres ensure that constraint triggers will be
> > executed in alphabetical order.
> 
> Only within a single event, though, so I don't think fooling with the
> trigger names will do anything to resolve the sorts of problems people
> are dealing with.
> 
> The most promising quick-fix I've heard suggested is to mark all the FK
> constraints as deferred until end of transaction.  That would reduce the
> time window in which the locks are held to a short interval and thus
> make deadlocks less likely (not impossible, certainly, but less likely).

We would probably have to allow the deferred trigger queue to spill to
disk if we do that, of course.

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