Virtual Sequential Access Method
Virtual Storage Access Method (VSAM) is an IBM Direct access storage device, direct-access storage device (DASD) file storage access method, first used in the OS/VS1, OS/VS2 OS/VS2 (SVS), Release 1 (SVS) and MVS, 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 (IBM mainframe), data set ''organizations'': key-sequenced data set, key-sequenced (KSDS), relative record data set, relative record (RRDS), entry-sequenced data set, entry-sequenced (ESDS) and linear data set, linear (LDS). The KSDS, RRDS and ESDS organizations contain records, while the LDS organization (added later to VSAM) contains a sequence of pages with no intrinsic record structure, for use as a memory-mapped file. Overview An IBM ''Redbook'' named "VSAM PRIMER" (especially when used with the "Virtual Storage Access Method (VSAM) Options for Advanced Applications" manual) expl ...
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Datamation
''Datamation'' is a computer magazine that was published in print form in the United States between 1957 and 1998,Venerable IS Journal Shuts Down
Sharon Machlis // ComputerWorld, page 15, 19 January 1998 and has since continued publication on the web. ''Datamation'' was previously owned by QuinStreet and acquired by TechnologyAdvice in 2020. Datamation is published as an online magazine at Datamation.com.

History and profile

Its predecessor started as a trade/engineering magazine called ''Research & Engineering'' (1955–1957). In 1957 it was rebranded to ''The Magazine of Datamation'' (from the issue no. 7), and in ...
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