Simon Riggs <si...@2ndquadrant.com> writes:
> On 21 December 2012 16:51, Kevin Grittner <kgri...@mail.com> wrote:
>> If none, and this is strictly an optimization, what are the benchmarks
>> showing?

> AFAIK its well known that a check constraint is much faster than a
> trigger.

I don't believe that that's "well known" at all, at least not for
apples-to-apples comparison cases.  A C-coded BEFORE trigger doesn't
have very much overhead; I suspect it's probably comparable to
expression evaluation setup overhead.  I think if you want to argue
for this on performance grounds, you need to actually prove there's
a significant performance advantage, not just assume there will be.

                        regards, tom lane


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