mdtendulkar
Active User
Joined: 29 Jul 2003 Posts: 237 Location: USA
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Hello vamseepotti,
Folowing is the excerpt from the JCL User's Guide
Restarting after Abnormal Termination
If a job terminates abnormally, the checkpoint/restart facilities allow you to restart the job, as follows:
1) Automatic step restart, that is, restart by the system from the beginning of a job step.
2) Automatic checkpoint restart, that is, restart by the system from a checkpoint within a job step.
3) Deferred step restart, that is, restart at a later time from the beginning of a job step.
4) Deferred checkpoint restart, that is, restart at a later time from a checkpoint within a job step.
Restarts are controlled by:
1) RD parameters on JOB and EXEC statements. (Restart is not supported for started tasks; do not use the RD parameter on the JOB statement for a started task.)
2) Checkpoints, if written. Each time a CHKPT macro is executed, a checkpoint is written.
3) The job journal, which is only required for an automatic restart. In a JES3 system, the programmer can code a JOURNAL parameter on the JES3 //*MAIN statement to control whether JES3 creates a journal for the job.
4) In deferred restarts, a RESTART parameter on the JOB statement for the restarting job and a SYSCHK DD statement to identify the data set containing the checkpoint written in response to the CHKPT macro. (Restart is not supported for started tasks; do not use the RESTART parameter on the JOB statement for a started task.)
check out the following link for more details
MVS JCL User's Guide
Hope this helps,
Regards
Mayuresh Tendulkar |
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