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Mainframe Technologies: Endevor, COBOL, JCL, and VSAM
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How many extents are possible for a sequential file,VSAM file
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A
16 for sequential, 123 for VSAM
💡 Explanation:
In mainframe JCL, sequential files are limited to 16 extents while VSAM (Virtual Storage Access Method) files can extend up to 123 extents. An extent is a contiguous set of disk tracks allocated to a dataset. When a file grows beyond its initial allocation, it can extend to additional extents up to these system-defined limits.