Chapter 1-3: Data Dictionary

Memory Files

Memory files are user-specific files (i.e., they can never be shared between users) loaded into the system’s main memory, and are not retained after a user exits APPX. Because the files are maintained in memory, the quantity of data these files contain is generally relatively small. Excessive or improper use of memory files can result in a memory overflow condition.

The principal reason to use a memory file is to improve performance. The system will always take less time to retrieve data from files maintained in memory than to retrieve data from files stored on disk.

There are three different levels of interprocess communication between memory files: subprocess, related, and detached. See Chapter 1-5 for information about interprocess communication.

APPX Application Design Manual (01/13/03)

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