[pybsddb] How to get Btree len inside a transaction?

[Jesus Cea]

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On 11/03/14 02:49, Matt Chaput wrote:
> How do I get the number of keys in the database inside a
> transaction? I can't see a way to do it in the API. If I just try
> to do len(btree) on a btree I opened with the txn keyword, it locks
> up.

How many keys do you think you have?. Berkeley DB doesn't have a
counter, so it will iterate over ALL the database. If it is big, it
can take a long time.

If you need this information frequently and fast, you will need to
keep a counter by yourself, probably not difficult to keep it in sync
if you are using transactions.

Anyway, what are you looking for is this:

http://www.jcea.es/programacion/pybsddb_doc/db.html#stat

Check "nkeys" field. check also the C API, for the "FAST" flag and the
traversal of the tree:
<http://docs.oracle.com/cd/E17076_03/html/api_reference/C/dbstat.html>

Hope it helps.

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