On 2007-04-15, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> cluster <skrald@amossen.dk> writes:
>> It seems that the FK triggers for the table are evaluated even though
>> none of the FK columns are altered.
>
> Hm, they're not supposed to be, at least not in reasonably modern
> PG releases (and one that breaks out trigger runtime in EXPLAIN ANALYZE
> should be modern enough IIRC). Exactly which PG release are you
> running? Can you provide a self-contained test case?
Looking at current CVS code the RI check seems to be skipped on update of
the _referred to_ table if the old and new values match, but not on update
of the _referring_ table.
--
Andrew, Supernews
http://www.supernews.com - individual and corporate NNTP services