The ENVIRONMENT options applicable to regional data sets are:
REGIONAL({1})
F
RECSIZE(record-length)
BLKSIZE(block-size)
SCALARVARYING
Use the REGIONAL option to define a file with regional organization.
>>-REGIONAL--(--1--)-------------------------------------------><
Although REGIONAL(1) data sets have no recorded keys, you can use REGIONAL(1) DIRECT INPUT or UPDATE files to process data sets that do have recorded keys.
REGIONAL(1) organization is most suited to applications where there are no duplicate region numbers, and where most of the regions will be filled (reducing wasted space in the data set).