RelStorage 3.0 is supported on Python 2.7.9+, Python 3.5, 3.6, 3.7, and 3.8, as well as PyPy2 and PyPy 3 7.1 or later.

You can install RelStorage using pip:

pip install RelStorage

If you use a recent version of pip to install RelStorage on a supported platform (OS X, Windows or “manylinx”), you can get a pre-built binary wheel. If you install from source or on a different platform, you will need to have a functioning C/C++ compiler and the ability to compile Cython extensions.

RelStorage requires ZODB 5. To use ZODB and ZEO 4 (which supports Python 2.7.8 and earlier), install RelStorage 2.1. If you need to use even older versions of ZODB/ZEO, install RelStorage 1.6. Likewise, if you need Python 2.6 support, install RelStorage 1.6 (note that 1.6 does not run on Python 3 or PyPy).

Database Adapter

You also need the Python database adapter that corresponds with your database.


The easiest way to get the recommended and tested database adapter for your platform and database is to install the corresponding RelStorage extra; RelStorage has extras for all three databases that install the recommended driver on all platforms:

pip install "RelStorage[mysql]"
pip install "RelStorage[postgresql]"
pip install "RelStorage[oracle]"
pip install "RelStorage[sqlite3]"

Installing those packages may require you to have database client software and development libraries already installed. Some packages may provide binary wheels on PyPI for some platforms. In the case of psycopg2, that binary package (which is not recommended for production use) can be installed with the name psycopg2-binary. Note that the postgresql extra in RelStorage does not install the binary but attempts to install from source.

Memcache Integration


Memcache support is deprecated and will be removed in a future release.

If you want to use Memcache servers as an external shared cache for RelStorage clients, you’ll need to install either pylibmc (C based, requires Memcache development libraries and CPython) or python-memcached (pure-Python, works on CPython and PyPy, compatible with gevent).

Once RelStorage is installed, it’s time to configure the database you’ll be using.