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.
zodbconvertutility 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: