> Yeah, a scan over just the index itself would be a perfect way to
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I believe that Oracle updates index statistic on-fly...
Meta-page is always in cache for inserts, so there will be no
additional reads.
> gather stats. The normal objection to it (can't tell whether entries
> correspond to currently-valid tuples) doesn't apply, because we don't
> really care whether the stats are perfectly accurate.
Vadim