Simon Riggs <simon@2ndQuadrant.com> writes:
> On 21 December 2012 16:51, Kevin Grittner <kgrittn@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
