Alvaro Herrera <alvherre@xxxxxxxxxxxxxx> writes: > Hmm, yeah, sounds useful. There's one implementation issue to notice > however, and it's that the autovacuum process dies and restarts for each > iteration, so there's no way for it to remember previous state unless > it's saved somewhere permanent, as the stats info is. I think you'd really need to remember the previous oldest XID on a per-table basis to get full traction out of the idea. But weren't we thinking of tracking something isomorphic to this for purposes of minimizing anti-wraparound VACUUMs? regards, tom lane
