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Line 1: '''Virtual Sequential Access Method''' ('''VSAM''') is an [[IBM]] disk file storage scheme first used in the [[S/370]] and [[virtual storage]]. VSAM comprises three access methods: Keyed Sequential Data Set (KSDS), Relative Record Data Set (RRDS) and Entry Sequenced Data Set (ESDS). ''KSDS'' has indexes and data split into CI (Control Interval) in CA (Control Area) and multi index levelled. Forward and backward compression is applied to key values. Both [[IMS/DB]] and [[DB2]] are implemented on top of VSAM and use its underlying data structures.

Virtual Storage Access Method: Difference between revisions