Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Language Reference Manual

Regional

The regional data set organization is divided into numbered regions, each of which can contain one record. The regions are numbered in succession, beginning with zero. A region can be accessed by specifying its region number, and perhaps a key, in a data transmission statement. The key specifies the region number and identifies the region to allow optimized direct retrieval, replacement, addition, and deletion of records.


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