Using checkpoint/restart with DFSORT

You cannot use checkpoints taken while DFSORT is running under z/OS® to restart, unless the checkpoints are taken by DFSORT.

Checkpoints taken by a COBOL program while SORT or MERGE statements execute are invalid; such restarts are detected and canceled.

To take a checkpoint during a sort or merge operation, do these steps:

  1. Add a DD statement for SORTCKPT in the JCL.
  2. Code the RERUN clause in the I-O-CONTROL paragraph:
    RERUN ON assignment-name
  3. Code the CKPT (or CHKPT) keyword on an OPTION control statement in the sort control statement data set (default ddname IGZSRTCD).