Rational Developer for System z
PL/I for Windows, Version 7.6, Programming Guide

Choosing a data set type

When planning your application, you must first decide which type of data set to use. There are three types of workstation VSAM data sets available to you. Workstation VSAM data sets can provide all the function of the other types of data sets, plus additional function available only with workstation VSAM. Workstation VSAM can usually match, or even improve upon, the performance of other data set types. However, workstation VSAM is more subject to performance degradation through misuse of function.

Table 18 shows you the possibilities available with each type of workstation VSAM data set. When choosing between the workstation VSAM data set types, you should base your decision on the most common sequence in which your program accesses your data.

Table 19, Table 20, and Table 21 show the statements allowed for sequential data sets, keyed data sets, and direct data sets, respectively.


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