Re: "Healing" a table after massive updates

Gregory Stark <stark@enterprisedb.com> writes:
> Incidentally the visibility bugs are indeed entirely fixed in 8.3. In 8.2 and
> before cluster and alter table rewrites can both cause tuples to not appear
> for transactions which were started before the cluster or alter table such as
> a long-running pg_dump.

AFAIK that's true only for CLUSTER, not ALTER TABLE.  There would be a
bunch of logical inconsistencies in altering rows and then pretending
you hadn't.

            regards, tom lane