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

Updating a sequential data set

The program illustrated in Figure 19 can be used to update a workstation VSAM sequential data set. If it is run again, new records are added on the end of the data set.

You can rewrite existing records in a sequential data set, provided that the length of the record is not changed. You can use a SEQUENTIAL or KEYED SEQUENTIAL update file to do this. If you use keys, they must be sequential record values from a previous WRITE or READ statement.


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