Understanding general recovery concepts

This information provides a general overview of recovery concepts. After reading this information, you should understand the following:

• Why you would want to provide recovery for your programs.
• What software errors result in your recovery getting control, if you provide recovery.
• What we mean when we say a program abnormally ends.
• The different states for a recovery routine.
• The difference between a mainline routine, a recovery routine, a retry routine, and a resource manager.
• The difference between an extended specify task abnormal exit (ESTAE-type) recovery routine and a functional recovery routine (FRR), and how to choose, define, and activate the appropriate one.
• The difference between what it means to retry and what it means to percolate.
• How routines in a recovery environment interact.