Understanding Access Methods and I/O in z/OS®


Reading and writing files in z/OS systems differs markedly from similar processes in other architectures. A combination of dataset structure, control blocks, and macros, called an Access Method, allows programs to read and write data on the record or block level, control buffering, provide sequential or direct access, and end-of-file processing.

In this webinar, we discuss the unique features of z/OS access methods (BSAM, QSAM, VSAM), control blocks (the DCB, JFCB, TIOT), and macros (GET/PUT, READ/WRITE) that are the basis for reading and writing all types of datasets in mainframe systems.

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