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Access method information


An access method is a function of a mainframe operating system that enables access to data on disk, tape or other external devices. Access methods were present in several mainframe operating systems since the late 1950s, under a variety of names; the name access method was introduced in 1963 in the IBM OS/360 operating system.[1] Access methods provide an application programming interface (API) for programmers to transfer data to or from device, and could be compared to device drivers in non-mainframe operating systems, but typically provide a greater level of functionality.

  1. ^ M. A. Auslander, D. C. Larkin, A. L. Scherr: "The Evolution of the MVS Operating System", pages 478-479 Archived November 19, 2008, at the Wayback Machine

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Access method

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An access method is a function of a mainframe operating system that enables access to data on disk, tape or other external devices. Access methods were...

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ISAM

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Indexed Sequential Access Method (ISAM) is a method for creating, maintaining, and manipulating computer files of data so that records can be retrieved...

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Channel access method

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In telecommunications and computer networks, a channel access method or multiple access method allows more than two terminals connected to the same transmission...

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Virtual Storage Access Method

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Virtual Storage Access Method (VSAM) is an IBM direct-access storage device (DASD) file storage access method, first used in the OS/VS1, OS/VS2 Release...

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Virtual Telecommunications Access Method

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Virtual Telecommunications Access Method (VTAM) is the IBM subsystem that implements Systems Network Architecture (SNA) for mainframe environments. VTAM...

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Basic direct access method

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Basic Direct Access Method, or BDAM is an access method for IBM's OS/360 and successors computer operating systems on System/360 and later mainframes....

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Captive portal

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WISPr refers to this web browser-based authentication method as the Universal Access Method (UAM). Captive portals are primarily used in open wireless...

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Multiplexing

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further extended into a multiple access method or channel access method, for example, TDM into time-division multiple access (TDMA) and statistical multiplexing...

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IBM Information Management System

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native z/OS access method, or Overflow Sequential (OSAM), an IMS-specific access method that optimizes the I/O channel program for IMS access patterns....

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Sequential access

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access is sometimes the only way of accessing the data, for example if it is on a tape. It may also be the access method of choice, for example if all that...

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Queued Telecommunications Access Method

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Queued Telecommunications Access Method (QTAM) is an IBM System/360 communications access method incorporating built-in queuing. QTAM was an alternative...

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Queued Sequential Access Method

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In IBM mainframe operating systems, Queued Sequential Access Method (QSAM) is an access method to read and write datasets sequentially. QSAM is available...

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Telecommunications Access Method

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Access Method (TCAM) is an access method, in IBM's OS/360 and successors computer operating systems on IBM System/360 and later, that provides access...

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Medium access control

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access method is used. The channel access control mechanism relies on a physical layer multiplex scheme. The most widespread multiple access method is...

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Basic telecommunications access method

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Basic Telecommunications Access Method (BTAM) is a low-level programming interface specified by IBM for use on the IBM System/360 for start-stop and binary...

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Suicide methods

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suicide methods less accessible leads to an overall reduction in the number of suicides. Some method-specific ways to do this include restricting access to...

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Mutator method

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private member variable. They are also known collectively as accessors. The mutator method is most often used in object-oriented programming, in keeping...

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Spatial database

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arbitrary metric. Octree PH-tree Quadtree R-tree: Typically the preferred method for indexing spatial data. Objects (shapes, lines and points) are grouped...

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Object access method

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Object access method (OAM) is an access method under z/OS which is designed for the storage of large numbers of large files, such as images. It has a...

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Basic sequential access method

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In IBM mainframe operating systems, Basic sequential access method (BSAM) is an access method to read and write datasets sequentially. BSAM is available...

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Basic access authentication

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In the context of an HTTP transaction, basic access authentication is a method for an HTTP user agent (e.g. a web browser) to provide a user name and...

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Internet access

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networks. In developing countries mobile broadband is often the only access method available. Traditionally the divide has been measured in terms of the...

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Token Ring

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passing is a channel access method providing fair access for all stations, and eliminating the collisions of contention-based access methods. Token Ring was...

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