ZEO is a client-server storage for ZODB for sharing a single storage among many clients. When you use ZEO, a lower-level storage, typically a file storage, is opened in the ZEO server process. Client programs connect to this process using a ZEO ClientStorage. ZEO provides a consistent view of the database to all clients. The ZEO client and server communicate using a custom protocol layered on top of TCP.
Some alternatives to ZEO:
- NEO is a distributed-server client-server storage.
- RelStorage leverages the RDBMS servers to provide a client-server storage.
The documentation is available on readthedocs.