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Database Essentials
OpenEdge RDBMS : OpenEdge architecture : Storage areas : Primary recovery area
Primary recovery area
The primary recovery area can contain as many fixed-length extents as needed, as long as the last extent is a variable length extent. The primary recovery area is also called the before-image area. The files, named .bn, record data changes. In the event of a database crash, the server uses the contents of the .bn files to perform crash recovery during the next startup of the database. Crash recovery is the process of backing out incomplete transactions.