Within an application server address space, many application programs run under a single server program. An error in one of these application programs can cause it to overwrite the code or data of the other application programs or of the server program itself. Subspaces provide a means of limiting the application server address space storage that an application program can reference, thus limiting the damage an application program error can do within the application server address space.

This section describes the concept of subspaces, when to use them, how to create them, how to manage them, and how to delete them. It also describes considerations for providing recovery for and diagnosing errors in programs that run in subspaces.