Virtual Storage Access Method: Entry Sequenced Data Set, Relative Record Data Set, IBM Mainframe Utility Programs - Brossura

 
9786131923135: Virtual Storage Access Method: Entry Sequenced Data Set, Relative Record Data Set, IBM Mainframe Utility Programs

Sinossi

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Virtual storage access method (VSAM) is an IBM disk file storage access method, first used in the OS/VS2 operating system, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS. Originally a record-oriented filesystem, VSAM comprises four data set organizations: Key Sequenced Data Set (KSDS), Relative Record Data Set (RRDS), Entry Sequenced Data Set (ESDS) and Linear Data Set (LDS). The KSDS, RRDS and ESDS organizations contain records, while the LDS organization (added later to VSAM) simply contains a sequence of bytes with no intrinsic record structure.

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