The system allows two types of step restart:

• Automatic step restart
• Deferred step restart

The system allows two types of checkpoint/restart:

• Automatic checkpoint/restart
• Deferred checkpoint/restart

Automatic restarts occur in different ways:

• Automatic step restarts at the beginning of a job step that has abended
• Automatic checkpoint/restart restarts at the last checkpoint taken before the job failed

Deferred restart occurs when a job is resubmitted with the RESTART parameter specified on the JOB statement:

• Deferred step restart occurs at the beginning of the job step specified in the RESTART parameter of the JOB statement.
• Deferred checkpoint/restart occurs at the checkpoint specified in the RESTART parameter of the JOB statement.