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

[Ryan Meinzer]

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On Tue, Mar 11, 2014 at 7:14 PM, Jesus Cea <jcea at jcea.es> wrote:

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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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