[pybsddb] len() sometimes slow for bsddb3 backed shelves

[Jesus Cea]

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Gregg Lind wrote:
> Sometimes len(S) will take upwards of 3 minutes (and sometimes, it is 
> instantaneous, expecially if it  len() has been called recently)!   Is 
> the problem in the shelve layer?  File I/O?  

Record counter is cached when you do a "db_stat". This counter is
invalidated when the database is updated.

> Working with bsddb files seems to be 
> something of a black art still.

Yes, Berkeley DB is very powerful and so, difficult to master. Well
used, the results are stunning.

When I complete the bindings to fully support Berkeley DB API, I intent
to write some wrappers automating the "difficult" issues when possible.

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