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

Data sets

Consecutive
Indexed
Relative
Regional

In addition to being used as input from and output to your terminal, data sets are stored on a variety of auxiliary storage media, including magnetic tape and direct-access storage devices (DASDs). Despite their variety, these media have characteristics that allow common methods of collecting, storing, and transmitting data. The organization of a data set determines how data is recorded in a data set and how the data is subsequently retrieved so that it can be transmitted to the program. Records are stored in and retrieved from a data set either sequentially on the basis of successive physical or logical positions, or directly by the use of keys specified in data transmission statements.

PL/I supports the following types of data set organizations:

The data set organizations differ in the way they store data and in the means they use to access data.


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