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1.    What the scheduler can do 

  • Many steps within a job :   A job can consist of many steps, each running a different program.  Each step waits for the previous step to run before it starts.

  • Periodic jobsA job can be scheduled to run every minute, hour, day, month, or any other specified time frame.

  • Dependent jobsA jobs can be scheduled to wait for another job to finish before it executes.

 2.      What the scheduler cannot do

  • Periodic dependent jobs: If you have a job that runs every night and another that depends on it, the dependent job will run the first time, but not again after that.

  • Continuing a job that has crashed: If a job crashes on step 1, the whole job stops, and there is no way to continue processing.

  • Re-running from certain job steps: If your job crashes at step 2, there is no facility to re-run, without changing the job and removing step 1 so it does not run again.

  • Waiting for a Batch Input Session: If you run a job which runs RSBDCSUB, the second step will not wait for the batch input session to process, as it is executing in a separate job.

 3.    Suggested methods for processing

  • Using a self-scheduling job: A program can be set up to re-schedule itself in a job after a specified time.  This is more flexible than a periodic job.

  • Jobs that create other jobs: An alternative to dependent jobs, is to run a program in the first job which will create the next job.

  • Jobs that wait for other jobs: You can write a custom program that waits for a specified job, and runs a batch input session.  Use this as a step in your job after a batch input session has run.

4.     System messaging

  •  Information and Success messages:  Write the message text to the job log. Program and job continues as normal.

  •  Error and Abend messages:  Write the message text to the job log. Stop the current program from running. Cancel the entire job. -> any dependent programs must be scheduled in a different job

 5.     Suggested methods for error handling & reprocessing 

  • If subsequent steps in a job are not dependent on the first one finishing successfully, the first  program should be set up to crash using a success message followed by the ‘STOP’ statement.

  • Before every error message, call a routine which notifies the ‘Operations Center’ of error type, severity, action, etc.




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