Re: back-bdb future

[Jonghyuk Choi <jongchoi@us.ibm.com>]

>For 2.2, we should probably consider using lists of IDL ranges. Could get
>ugly, but it might be more useful for large databases.

Another option would be to switch to coarse grained IDL which points to
a fixed range of consecurive IDs. It's effectively the same as changing
the ID's base to 2^n. Entire IDL or portions of it could be changed to
use this coarse grained ID. Advantages are 1) simple list management and
2) bounded overhead. Worst case 2^n times more IDs. Common case overhead
would be very low, if we assume there's a locality of IDs (ex for dn2id
subtree).

- Jong