ZODB4
Persistent Python

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ZODB / ZODB Introduction

ZODB Introduction

ZODB makes it really fast and easy to build and distribute Persistent Python applications. Just subclass `Persistent`, and your objects and application become persistent.  ZODB is in heavy use in the Pyramid and Plone communities. It is used in this website, and at PrivaCV.com.  Multiple people report ZODB to be rock solid.  No Zope required.
 
ZODB uses optimistic concurrency control to provide ACID properties and Snapshot isolation to python transactions.  ZODB is very good for applications which feature many reads and comparatively few writes.  Not so good for an airline reservation system.  ZODB scales wonderfully.  If a single server is not fast enough, deploy a ZEO server.  ZEO provides a database server feeding application servers with cache invalidation, so it performs wonderfully in heavy read applications.   If that is not good enough, store the data in a PostgreSQL database using RelStorage.  Or store your blobs on the file system, or in Amazon S3 storage.  For larger applications, you can shard your data across multiple databases.  And since it is mostly written in Python, it is really fast and easy to make any optimizations you need.    

 ZODB has significant advantages over other persistence technologies.  In relational databases it is hard and slow to store a tree.  JSON databases do store trees but not graphs.  MongoDB has problems with fine-grained transaction management across document boundaries. PostgreSQL has excellent transaction management, but does not support arrays of heterogeneous objects.  And of course once you are in a pure dynamic Python environment, there are all kinds of things that you can do that you could not even imagine doing with a traditional database.

ZODB is useful for building JSON servers.  There are a large number of Python libraries which support JSON.   Javascript does not have a `__getattr__` method, and would block on object fetching, so don't wait for something like ZODB to appear in the Javascript world anytime soon.

To summarize, ZODB makes it really easy to build and distribute persistent Python applications.  This introductory page answers the major questins, and links to the key resources that you will need if you are considering using the ZODB.




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