Re: back-bdb future

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

>At one point Kurt mentioned exploring using BDB itself for the cache,
using a
>memory-only database. Has anyone looked into this? I wonder what the
>semantics are for such a database in a transaction environment, since it
has
>no persistent store.

BDB cache's gain over database page cache may not be large.
In addition to the normal DB access overhead, transaction subsystem adds
3~7% of excess overhead even for non-transaction protected searches.
so... entry cache would still be considered as a higher perf store.
- Jong