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Virtual Storage Access Method
(redirected from Keyed sequential data set)

    Also found in: Wikipedia 0.04 sec.
(database)Virtual Storage Access Method - (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.



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