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

Types of data sets

PL/I defines two types of data sets—native data sets and workstation VSAM data sets.

Platform distinctions

This chapter refers to the access methods available on PL/I workstation products; however, all methods are not available on all platforms. As you refer to information in this chapter, use the following guideline:

To convert mainframe VSAM files to the corresponding DDM, ISAM, or BTRIEVE files, follow the procedure documented in the prolog for the LODVSAM utility (not yet supported on AIX). Make sure you specify the appropriate access method AMTHD(DDM|ISAM|BTRIEVE).

To convert DDM, ISAM, or BTRIEVE files to corresponding mainframe VSAM files, follow the procedure documented in the prolog for the RELOAD utility (not yet supported on AIX). These utilities should be in the samples directory for PL/I for Windows.

Data sets that reside on the mainframe can be accessed remotely by your PL/I program using the Distributed FileManager product that comes with SMARTdata Utilities (SdU), one of the PL/I for Windows components. You can find information about using SdU in the online books for that product. The online books for SdU are installed only if you select that component.

For Windows, refer to the Distributed FileManager User's Guide.

There are several types of native data sets:

Both record and stream I/O can be used to access these types of data sets, which can be accessed only in a sequential manner.

Additional types of PL/I-defined data sets include:

Only record I/O can be used to access regional data sets. Access can be either sequential or direct.


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