def METHOD_NAME(self):
    db = ZODB.DB(self.storage)
    cn = db.open()
    rt = cn.root()
    # Create a bunch of objects; the Data.fs is about 100KB.
    for i in range(50):
        d = rt[i] = PersistentMapping()
        transaction.commit()
        for j in range(50):
            d[j] = "a" * j
        transaction.commit()