Virtual Storage Access Method database
(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"?]
(2002-07-26)