The CKPT/CHKPT parameter instructs MFX to take a checkpoint at everyend-of-volume of a SORTOUT data set when OUTFIL is not used. Either spelling is accepted.
This parameter requires a SORTCKPT DD statement. It cannot be specified in conjunction with a user-issued STIMER macro or an incore sort. Checkpoints cannot be taken within a user exit routine.
See Performance Considerations for an explanation of the Checkpoint/Restart feature.