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Operating Systems Concepts - Engineering

Q1:

A file organization component of a VSAM file is:

A relative record data set

B keyed sequential data set

C entry sequential data set

D all of the above

E None of the above

ANS:D - all of the above

Virtual storage access method (VSAM) is an IBM DASD file storage access method, first used in the OS/VS1, OS/VS2 Release 1 (SVS) and Release 2 (MVS) operating systems, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS. Originally a record-oriented filesystem, VSAM comprises four data set organizations: Key Sequenced Data Set (KSDS), Relative Record Data Set (RRDS), Entry Sequenced Data Set (ESDS) and Linear Data Set (LDS).