Persistence

Persistence is the term used in computer science to describe a capability used by a computer programmer to store data structures in non-volatile storage such as a file system or a relational database.

Without this capability data structures only exist in-memory, and will be lost when a program exits. Persistence allows, for example, a program to be restarted and re-loaded with the data structures from a previous invocation of the program.

Design patterns solving this problem are container based persistence[?] and component based persistence[?].

Examples of persistence are using Java serialization[?] to store Java objects on disk or using J2EE to store Enterprise Java Beans in a relational database.