Memory-Based Files Overview

This facility enhances the PROIV filing system to provide support of keyed Memory-Based Files. A PROIV Application can do read/write/delete record processing against these files as if they were physically stored files.

A Memory-Based File resides in the virtual memory of the process that created it rather than directly on the disk. Memory is allocated when the file is opened, and the file remains in existence as long as PROIV is loaded. If the file is cleared, any excess space that was allocated is returned.

As only one user can access a particular Memory-Based File, there is no record locking or other concurrency controls. In addition, there is neither Commit nor Rollback functionality available.

The following file system operations are valid on Memory-Based Files:

Create
Clear
Read keyed record
Read next record
Change an existing record
Write or insert a new record
Delete the current record
SEL-ONLY and SEL_PARTIAL

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Topic ID: 720292