Physical Sequential

Physical Sequential

(file format)
(PS, QSAM, Queued Sequential Access Method) The simplest data set on an IBM mainframe. Sequential files can only be read or written from the beginning: they do not support random access.

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Since the open systems data is presented to the mainframe as a physical sequential dataset within a single 3390 volume, an organization can use its existing volume-level backup and restore procedures and utilities.

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