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RelStorage is a storage implementation for ZODB that stores pickles in a relational database. PostgreSQL 9.0 and above, MySQL 5.0.32+ / 5.1.34+, and Oracle 10g and 11g are currently supported. RelStorage replaced the PGStorage project.

• It is a drop-in replacement for FileStorage and ZEO.
• There is a simple way to convert FileStorage to RelStorage and back again. You can also convert a RelStorage instance to a different relational database.
• Designed for high volume sites: multiple ZODB instances can share the same database. This is similar to ZEO, but RelStorage does not require ZEO.
• According to some tests, RelStorage handles high concurrency better than the standard combination of ZEO and FileStorage.
• Whereas FileStorage takes longer to start as the database grows due to an in-memory index of all objects, RelStorage starts quickly regardless of database size.
• Supports undo, packing, and filesystem-based ZODB blobs.
• Both history-preserving and history-free storage are available.
• Capable of failover to replicated SQL databases.
• zodbconvert utility to copy databases.
• Free, open source (ZPL 2.1)

Documentation including installation instructions is hosted on readthedocs.

The complete changelog is also there.

RelStorage is hosted at GitHub:

https://github.com/zodb/relstorage