Queued Sequential Access Method
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High Quality Content by WIKIPEDIA articles! In IBM mainframe operating systems, a queued sequential access method (QSAM) is one of the access methods for files, or more properly data sets. QSAM files are unkeyed, with the records placed one after another, according to entry order. A program can process these files only sequentially, retrieving (with the READ statement or GET macro instruction) records in the same order as they are in the file. Each record is placed after the preceding record. QSAM files can be on tape, direct access storage devices (DASDs), unit-record devices, and terminals. QSAM processing is best for tables and intermediate storage.…mehr

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High Quality Content by WIKIPEDIA articles! In IBM mainframe operating systems, a queued sequential access method (QSAM) is one of the access methods for files, or more properly data sets. QSAM files are unkeyed, with the records placed one after another, according to entry order. A program can process these files only sequentially, retrieving (with the READ statement or GET macro instruction) records in the same order as they are in the file. Each record is placed after the preceding record. QSAM files can be on tape, direct access storage devices (DASDs), unit-record devices, and terminals. QSAM processing is best for tables and intermediate storage.