Recovering transactions after an application program failure

Transactions sent to IMS from LU 6.2 application programs are processed in the same way as non-LU 6.2 initiated transactions during application program failures.

If an application program fails before reaching a commit point while processing a local or remote transaction from an LU 6.2 device, IMS backs out all messages except those that were inserted to an alternate express PCB and committed with a PURG call. If the failure occurs after the transaction reaches a commit point, IMS recovers everything. If the failing application program's input message was received from another application program (program-to-program switch), this prior application program's processing is still committed (as is true for non-LU 6.2 application programs).