> > > > John, I think it's worth pointing out that Postgres most likely does a > full table scan to validate a constraint by design and not in optimization > oversight. Think of what's gonna happen if the index used for checking is > corrupted? > > This can't be true: a corrupted index is a failure mode, and failure modes are not expected in normal flow. Think of it this way: we must never use index scan, because if index is corrupted the results are going to be disastrous, so we will always do Seq Scans.
It's ok to assume index is not corrupted. -- Darafei Praliaskouski Support me: http://patreon.com/komzpa
