Virtual Storage Access Method definition 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
Both IMS/DB and DB2
are implemented on top of VSAM and use its underlying data structures.
["Storage" or "Sequential"?]