Use the three different types of data sets according to the following purposes:
- Use sequential data sets for data that you access
primarily in the order in which the records were created (or the reverse order).
- Use keyed data sets when you normally access records
through keys within the records (for example, a stock-control file where the
part number is used to access a record).
- Use direct data sets for data in which each item
has a particular number, and you normally access the relevant record by that
number (for example, a telephone system with a record associated with each
number).
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