Restarting and Checkpoint in JCL

CHAPTER - 11  Restarting and Checkpoint in JCL

Restarts are specified using the RD and RESTART parameters.

The RD parameter is used to request an automatic restart of a 
job if the job fails. 

The RESTART parameter is used to specify a restart point when 
a job is resubmitted. 

The RD parameter can be used within JOB and EXEC statements to request 
an automatic restart if the job fails. 
 
ESTART is used when we want to restart a job from a step , when 
it abended in a step 


Restarting When the System Failed in a JES2 System 
  
JES2 requeues the job for execution if RESTART=Y is in the JES2 
/*JOBPARM statement Re-execution is from the beginning of the job. 

  Example JCL: 
 
      //J3    JOB  ,'R. KRISHNA REDDY'
      /*JOBPARM  RESTART=Y
                 .
                 .
      //
Restarting When the System Failed in a JES3 System 

If the job was executing when the system failed, the FAILURE parameter 
on the JES3 //*MAIN statement tells JES3 how to   handle the job. The 
job can be restarted, cancelled, held, or printed and then held for restart. 

  Example JCL: 

     //J4    JOB  ,'R. KRISHNA',RD=NC
     //*MAIN FAILURE=RESTART
                 .
                 .  
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