The maximum number of DD statements per job step is 3273, based on the number of single DD statements allowed for a TIOT (task input output table) control block size of 64K. This limit can be different depending on the installation-defined TIOT size. The IBM-supplied default TIOT size is 32K. For information about changing the size of the TIOT, see z/OS MVS Programming: Authorized Assembler Services Guide.
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