DDE Revision Engine
From Big Database List
The Revision Engine offers a native way to store data in different version while each version is retrievable with a simple SQL statement. The retrieval of historical data is based on a modification of the way data is stored within a storage engine. The Revision Engine is not a new storage engine type but a type of middle ware between the MySQL server and the existing storage engines. Furthermore data storage is organized in different types of schema with different performance metrics offering the DBA the most performance method for the table types. Since the Revision engine is visible to the MySQL server as a storage engine the DBA can decide for every table if the data should be versioned or not.
