Re: BUG #12330: ACID is broken for unique constraints

Kevin Grittner <kgrittn(at)ymail(dot)com> writes:
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Yes. This will deliver a less meaningful error code,

> That depends entirely on whether you care more about whether the
> problem was created by a concurrent transaction or exactly how that
> concurrent transaction created the problem.

Just for starters, a 40XXX error report will fail to provide the
duplicated key's value. This will be a functional regression,
on top of breaking existing code.

I think an appropriate response to these complaints is to fix the
documentation to point out that duplicate-key violations may also
be worthy of retries. (I sort of thought it did already, actually,
but I see no mention of the issue in chapter 13.)

regards, tom lane