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virtual storage access method

virtual storage access method in Technology
(VSAM) An IBM disk file storage scheme first used in S/370 and virtual storage. VSAM comprises three access methods: Keyed Sequenced Data Set (KSDS), Relative Record Data Set (RRDS), and Entry Sequenced Data Set (ESDS).
Both IMS/DB and DB2 are implemented on top of VSAM and use its underlying data structures.
["Storage" or "Sequential"?]
The Free On-line Dictionary of Computing, © Denis Howe 2010
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