"Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> writes:
> Now that we have autovacuum on by default, we might get into random
> failures because of re-ordering. Though I don't seem to recall anybody
> complaining yet, it could just be that we are lucky or our regression
> suite don't have long enough running tests to give autovacuum chance
> to recycle some of the dead tuples.
No, the reason you don't see that is that plain VACUUM doesn't move
tuples around.
regards, tom lane