m_theologos wrote:

>
> Also, another _big_ advantage of using siblings would be that the
> indexes will be very fast navigable in _both_ ways

The problem with reverse navigation in Firebird indexes currently
is not their structure, but with the necessity of avoiding internal
deadlocks while permitting the recombination of nearly empty nodes.
Most index problems are simple if you assume indexes are read only.


Regards,


Ann