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data set organization : FOLDOC | data set organization (DSORG) An IBM term for file structure. These include PS physical sequential, DA {direct access}, IS {indexed sequential}, PO {partitioned} (a library). This system dates from OS/360, and breaks down beginning with VSAM and VTAM, where it is no longer applied. Sequential and indexed data sets can be accessed using either a "basic" or a "queued" "access method." For example a DSORG=PS file can use either BSAM (basic sequential access method) or QSAM (queued sequential access method). It can also be processed as a {direct file} using BDAM. Likewise a library can be processed using BPAM (basic partitioned access method), BSAM, QSAM, or BDAM. DSORG and access method are somewhat, but not completely, orthogonal. The "basic" access method deals with {physical blocks} rather than records, and usually provides more control over the specific device. Each I/O operation using the "basic" access method reads or write
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