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Oracle® Objects for OLE Developer's Guide
10g Release 1 (10.1)

Part Number B10118-01
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Thread Safety

OO4O release 2.2 and higher is thread-safe and can be used effectively in multithreaded applications and environments such as such as the Microsoft Internet Information Server (IIS). OO4O supports both the free and apartment threading models in COM/DCOM.

Access to OO4O object attributes are serialized when used with multiple threads of execution. To achieve maximum concurrency in query execution in a multithreaded application with OO4O, avoid sharing objects in multiple threads .

You should also avoid using commit and rollback operations on a session object that is shared among multiple threads since all connections associated with that session will be committed or rolled-back. If you want to perform commit and rollback operations on a session object, you should create a unique session object for each database object used.