Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Programming Guide

Pairing an Alternate Index Path with a File

When using an alternate index, you simply specify the name of the path in the DSNAME parameter of the DD statement associating the base data set/alternate index pair with your PL/I file. Before using an alternate index, you should be aware of the restrictions on processing; these are summarized in Table 26.

Given a PL/I file called PL1FILE and the alternate index path called PERSALPH, the DD statement required would be:

//PL1FILE DD DSNAME=PERSALPH,DISP=OLD

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