IBM MVS Question: Download IBM MVS PDF

What is PDES?

PDS can extend 15 time after it is allocated. PDSE can
extend 122 times.

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WHAT IS DIFFEENCE BETWEEN PDS AND PDES? STEPS BEFORE MERGING? DUMMY DATASET USES? DIFFERENCES BETWEEN IDCAMS AND ICETOOLS? DIFFERENCE BETWEEN ALL JCL UTILITY TOOLS?	What is the size of the address space in KBs for 16 bit address space?