> It appears that brtee indices (at least) can keep references
> to old toast values that survive a VACUUM! Seems these
> references live in nodes actually not referring to a heap
> tuple any more, but used during tree traversal in
> comparisions. As if an index tuple delete from a btree not
> necessarily causes the index value to disappear from the
> btree completely. It'll never be returned by an index scan,
> but the value is still there somewhere.
Would it be possible to actually delete those entries during vacuum ?
I guess that would be an overall win, no ?
Andreas
