Why does database.keys() method fail in shelve?

[TuxTrax]

>>> database = shelve.open("HH.database", "r")
>>> database.keys()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.0/shelve.py", line 55, in keys
    return self.dict.keys()
bsddb.error: (22, 'Invalid argument')

This is the error which I recieve when I try to list keys in the following 
*large* shelve file:

-rw-r--r--    1 mat      mat      92045312 Nov  1 02:19 HH.database

That seems to otherwise be functioning normally.

Any ideas why the keys method consistently refuses to work? Is there
an upper limit on the number of keys it can handle? The file Has like, 
25,000+ keys. If so, is there another method to use?

Cheers,

Mathew

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