Virtual Storage Access Method
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(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"?]Last updated: 2002-07-26
Virtual Storage Extended
(VSE, formerly DOS/VSE) is a multitasking, IBM 370-architected operating system similar to Multiple Virtual Storage (MVS).
VSE run jobs in partitions rather than address spaces, and uses POWER for input/output rather than JES, but is largely similar to MVS. Subsequent VSE/ESA releases gave VSE the XA-370 channel architecture, 31-bit virtual and real storage support, and data spaces. VSE is the IBM operating system on one-third of installed IBM 4381s and a significant proportion of IBM 9370s as well. It offers transaction processing and batch processing capabilities well beyond Virtual Machine's current capabilities, and has a close affinity with MVS.Last updated: 1997-06-09
Nearby terms:
Virtual Software Factory ♦ Virtual Storage Access Method ♦ Virtual Storage Extended
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