i've been trying, with minor success, to figure out how to use ZODB. i've now got a little app that uses a FileStorage db to store Person objects, where a Person has just a name and an age. it works the first time i run it, but subsequent times i get: Traceback (innermost last): File "./TestPersistence.py", line 29, in ? print GetPeople() File "./TestPersistence.py", line 16, in GetPeople app = TryPersistence.App() File "./TryPersistence.py", line 27, in __init__ self.db = ZODB.DB( ZODB.FileStorage.FileStorage( file ) ) File "/usr/local/src/Zope-2.1.3-src/lib/python/ZODB/FileStorage.py", line 262, in __init__ lock_file(f) File "/usr/local/src/Zope-2.1.3-src/lib/python/ZODB/lock_file.py", line 101, in lock_file raise error, ( ZODB.POSException.StorageSystemError: Could not lock the database file. There must be another process that has opened the file. i assume i'm missing some cleanup or finalization, beyond get_transaction().commit() any ideas? (i didn't post the code because it seemed overly lengthy for this question. i can post it if that'd help.) thanks -- Garry Hodgson Every night garry@sage.att.com a child is born Software Innovation Services is a Holy Night. AT&T Labs - Sophia Lyon Fahs