Re: Deferrable Unique Constraints

Greg Stark <gsstark@mit.edu> writes:
> I don't see how you're in the clear. If session A does an insert and it
> doesn't see a duplicate and doesn't commit, but then B does an insert and sees
> the duplicate from A and marks his tentative, and then commits, shouldn't B's
> commit succeed?

No.  B, being the second to get there, has to wait to see if A commits
or not.  This is true already and it wouldn't change.  We would
however postpone the wait until B's commit time.
        regards, tom lane