RelStorage is a storage implementation for ZODB that stores pickles in
a relational database. PostgreSQL 9.0 and above (performance is best
with 9.5 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
Supports undo, packing, and filesystem-based ZODB blobs.
Both history-preserving and history-free storage are available.