zodb

I am using ZODB first time. Just trying to commit the data with FileStorage. But when I do the same script second time I am not able to commit the new object. Here is my script from ZODB import FileStorage,DB import transaction storage = FileStorage.FileStorage('/tmp/test.fs') db = DB(storage) conn = db.open() root = conn.root() #root['layer']={} root['layer']['2b']={"id":'2b','name':'some name'} transaction.commit() conn.close() db.close() storage.close() when I repeat the code once again, with just changing the id root['layer']['2c'] and come out of the python, the second time object is not

I read several ZODB tutorials but here is one thing I still don't get: How do you free memory that is already serialized (and committed) to the (say) FileStorage? More specifically, I want the following code to stop eating all my memory: for i in xrange(bignumber): iobtree[i]=Bigobject() # Bigobject is about 1Mb if(i%10==0): transaction.commit() # or savepoint(True) transaction.commit() How can this be achieved? Is it possible to release references stored by iobtree and replace them by 'weak references' that would be accessible on demand? Creating savepoints and commiting the transaction

I am trying to use ZODB 3.10.2 on my web server which is running Debian and Python 2.7.1. It seems like every time I try to access the same database from 2 different processes, I get a mysterious exception. I tried accessing a database from an interactive Python session and everything seemed to work fine: >>> import ZODB >>> from ZODB.FileStorage import FileStorage >>> storage = FileStorage("test.db") >>> But then I tried the same series of commands from another session running at the same time and it didn't seem to work: >>> import ZODB >>> from ZODB.FileStorage import FileStorage >>> storage

The ZODB blobstorage directory contains a .layout file with the string 'lawn', 'bushy'. What is the difference between the various blob storage directory formats? It is explained here: http://svn.zope.org/ZODB/trunk/src/ZODB/tests/blob_layout.txt?rev=101802&view=markup FTA: ====================== Blob directory layouts The internal structure of the blob directories is governed by so called layouts . The current default layout is called bushy . The original blob implementation used a layout that we now call lawn and which is still available for backwards compatibility. Layouts implement two