Virtual Storage Access Method


Virtual Storage Access Method

(database)(VSAM) An IBM disk file storage scheme first usedin S/370 and virtual storage. VSAM comprises three accessmethods: 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 useits underlying data structures.