Gregory Stark wrote:
> However I'm a bit puzzled how you could possibly maintain this frozenxid. As
> soon as you freeze an xid you'll have to visit all the other pages covered by
> that visibility map page to see what the new value should be.
Right, you could only advance it when you scan all the pages covered by
the visibility map page. But that's better than having to scan the whole
relation.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com