Subject Re: [Firebird-Architect] Bi-directional indexes
Author Ann W. Harrison
Dmitry Yemanov wrote:
> In Oracle, empty index blocks are marked as free but remain in the index
> structure, i.e. they cannot be reused for other purposes, AFAIK.

Which is approximately what I suggested. They can be eliminated from
the upper levels, as long as they stay in the level where they were created.