When your testing shows the entire application (or group of applications,
if running more than one application in an IMS region, or on TSO) receives
the expected results, you can move the entire unit over to production use.
However, in case of unexpected errors, be prepared for instant recovery:
- Under z/OS, run the old version as a substitute from the latest productivity
checkpoint.
- Under DB2, CICS, and IMS, return to the last commit point and then continue
processing from that point using the unmigrated COBOL program. (For DB2, use
an SQL ROLLBACK WORK statement.)
- For batch applications, use your shop's backup and restore facilities
to recover.
After you move your existing applications to production use under the Language Environment run time, monitor
your applications for a short time to ensure that they continue to work properly.
Then, you can run with the confidence that you had in your previous run time.