To create an indexed sequential data set in more than one step, create the first group of records using the procedure in “one-step method”. This first group of records must contain at least one data record. The remaining records can then be added to the end of the data set in subsequent steps, using resume load. Each group to be added must contain records with successively higher keys. This method lets you allocate the indexed sequential data set in several short time periods rather than in a single long one.

This method also lets you provide limited recovery from uncorrectable output errors. When an uncorrectable output error is detected, do not attempt to continue processing or to close the data set. If you have provided a SYNAD routine, it should issue the ABEND macro to end processing. If no SYNAD routine is provided, the control program will end your processing. If the error shows that space in which to add the record was not found, you must close the data set; issuing subsequent PUT macros can cause unpredictable results. You should begin recovery at the record following the end of the data as of the last successful close. The rerun time is limited to that necessary to add the new records, rather than to that necessary to re-create the entire data set.