"Jim C. Nasby" <jnasby@xxxxxxxxxxxxx> writes: > I can't seem to find info about this in the docs, or on the web. http://developer.postgresql.org/docs/postgres/storage-page-layout.html Currently, when a tuple is reclaimed by VACUUM, we just mark its item pointer as unused (and hence recyclable). I think it might be safe to decrease pd_lower if there are unused pointers at the end of the page's pointer array, but we don't currently do that. In any case there could still be unused pointers embedded within the array. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
