The REGIONAL(1) option defines a file with the regional organization.
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A data set with regional organization contains fixed-length records that do not have recorded keys. Each region in the data set contains only one record; therefore, each region number corresponds to a relative record within the data set (that is, region numbers start with 0 at the beginning of the data set).
For information about how you use regional data sets, see Defining and using regional data sets.