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Physical Sequential

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(file format)Physical Sequential - (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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