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PDAB—Construct a parallel data access block (QSAM) z/OS DFSMS Macro Instructions for Data Sets SC23-6852-02 |
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The PDAB macro is used with the GET (TYPE=P) macro. It defines an area in the problem program where the open and close routines build and maintain a queue of DCB addresses for use by the get routine. The parallel data access block is constructed during the assembly of the problem program. MAXDCB must be coded in the PDAB macro, because it cannot be supplied from any other source. Certain data set characteristics prevent a DCB address from being available on the queue—see the description of QSAM parallel input processing in z/OS DFSMS Using Data Sets. Restriction: Do not use the PDAB macro if a QSAM GET will be used in 31-bit addressing mode. UNIX files: OPEN ignores the PDAB for a DCB that is for a UNIX file or subsystem data set. The format of the PDAB macro is:
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Copyright IBM Corporation 1990, 2014
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