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A backend for ZODB that stores pickles in a relational database.

Project description

RelStorage is a storage implementation for ZODB that stores pickles in a relational database. PostgreSQL 8.1 and above, MySQL 5.0.32+ / 5.1.34+, and Oracle 10g and 11g are currently supported. RelStorage replaced the PGStorage project.

Features

  • 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

Documentation including installation instructions is hosted on readthedocs.

The complete changelog is also there.

Development

RelStorage is hosted at GitHub:

https://github.com/zodb/relstorage

Project details


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