VSAM - meaning and definition. What is VSAM
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What (who) is VSAM - definition

IBM DISK FILE STORAGE ACCESS METHOD
VSAM; Virtual Sequential Access Method; Virtual sequential access method; Virtual storage access method

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Virtual Storage Access Method
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Virtual Sequential Access Method (Reference: SAM)

Wikipedia

Virtual Storage Access Method

Virtual Storage Access Method (VSAM) is an IBM DASD file storage access method, first used in the OS/VS1, OS/VS2 Release 1 (SVS) and Release 2 (MVS) operating systems, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS. Originally a record-oriented filesystem, VSAM comprises four data set organizations: key-sequenced (KSDS), relative record (RRDS), entry-sequenced (ESDS) and linear (LDS). The KSDS, RRDS and ESDS organizations contain records, while the LDS organization (added later to VSAM) simply contains a sequence of pages with no intrinsic record structure, for use as a memory-mapped file.