Rational Developer for System z
PL/I for Windows, Version 7.6, Programming Guide

Dummy records

Records in a REGIONAL(1) data set are either actual records containing valid data or dummy records. A dummy record in a REGIONAL(1) data set is identified by the constant X'FF' in its first byte. Although such dummy records are inserted in the data set either when it is created or when a record is deleted, they are not ignored when the data set is read. Your PL/I program must be prepared to recognize them. You can replace dummy records with valid data.


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