Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Programming Guide

Specifying record format

If you give record-format information, it must be compatible with the actual structure of the data set. For example, if you create a data set with FB-format records, with a record size of 600 bytes and a block size of 3600 bytes, you can access the records as if they are U-format with a maximum block size of 3600 bytes. If you specify a block size of 3500 bytes, your data is truncated.


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