Andres Freund <andres@2ndquadrant.com> writes:
> On 2012-11-29 09:10:22 +0900, Michael Paquier wrote:
>> and is going to need a lot of rework as well as more infrastructure
>> like a better MVCC-ish SnapshotNow.
> Which is a major project in itself. I wonder whether my crazy "follow
> updates via t_ctid isn't the actually easier way to get there in the
> short term. On the other hand, a more MVCCish catalog access would be
> awesome.
Yeah, eliminating the race conditions for SnapshotNow scans would be
valuable enough to justify a lot of work --- we could get rid of a
bunch of kluges once we had that, not to mention that Simon's project of
reducing ALTER TABLE lock strength might stand a chance of working.
regards, tom lane