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Virtual Storage Access Method. Virtual Storage Access Method (VSAM) [1] is an IBM direct-access storage device (DASD) file storage access method, first used in the OS/VS1, OS/VS2 Release 1 (SVS) and Release 2 (MVS) operating systems, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS.
It is a running record of all of a person's individual tax events including refunds, payments, penalties and tax payer status. [1] It is a batch-driven application that uses VSAM files. [2] Written in assembly language and COBOL, the IMF was originally created by IBM for the IRS in the 1960s to run with an IBM System/360 and associated tape ...
The Distributed File Management (DFM) [8] project was initiated to add DDM services to IBM's MVS operating system to enable programs on remote computers to create, manage, and access VSAM files. John Hufferd, the manager of the DFM project looked to the DDM Architecture team for a means of converting the data fields in records as they flowed ...
IDCAMS was introduced along with VSAM in OS/VS; the "Access Method" reference derives from the initial "VSAM replaces all other access methods" mindset of OS/VS. IDCAMS probably has the most functionality of all the utility programs, performing many functions, for both VSAM and non-VSAM files.
An entry-sequenced data set ( ESDS) is a type of data set used by IBM 's VSAM computer data storage system. [1] : 5 Records are accessed based on their sequential order, that is, the order in which they were written to the file; which means that accessing a particular record involves searching all the records sequentially until it is located ...
VSAM also included a catalog component used for user catalogs and MVS' master catalog. Partitioned data sets (PDS) are sequential data sets subdivided into "members" that could each be processed as sequential files in their own right (like a folder in a file system). The most important use of PDSes was for program libraries - system ...
IBM Information Management System (IMS) utilizes a hierarchical database model, distinct from IBM's later relational database model as seen in IBM Db2. In IMS, data is organized into segments, each comprising multiple fields, structured hierarchically to manage complex relationships effectively. [5] For instance, in a customer database, a root ...
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