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Access method services
Access method services reference

MOTCLE	ABBREVIATION	DESCRIPTION
access method		A technique for moving data between main storage and input/output devices
access method		A technique for moving data between main storage and I/O devices
Access method		An IBM-specific bit of jargon for software which moves data between main store and I/O devices. Access methods create channel programs and manage system buffers, and have implicit file structures. IBM access methods include TCAM, BTAM, VTAM, VSAM.
access method services	AMS	A multifunction utility named IDCAMS that is used to manage catalogs, devices, and both VSAM and non-VSAM data sets
access method services	AMS	langage de commande pour la gestion des fichiers VSAM (programme IDCAMS)
access method services	AMS	The utility that allocates and configures VSAM data sets. AMS is invoked through the AMSERV command in CMS
AM		See Access Method.
AMS		Access Method Services. z/OS and VSE subsystem for performing various data-related actions on VSAM and ICF catalogs, including defining VSAM datasets, and deleting and copying most dataset types. In short, a multi-purpose utility. Also known as IDCAMS because that is the program name you specify.
AMS		Access method services
basic direct access method		An access method used to directly retrieve or update particular blocks of a data set on a direct access device
basic partitioned access method	BPAM	An access method that can be used to create program libraries in direct access storage for convenient storage and retrieval of programs
basic partitioned access method	BPAM	m?thode d'acc?s pour fichiers partitionn?s
basic sequential access method	BSAM	An access method for storing or retrieving data blocks in a continuous sequence, using either a sequential access or a direct access device
basic sequential access method	BSAM	m?thode d'acc?s s?quentielle pour fichiers
basic sequential access method	BSAM	An access method for storing or getting data blocks in a continuous sequence (using either a sequential access or direct access device)
Basic Sequential Access Method	BSAM	The simplest data set on an IBM mainframe. A sequential file access method for reading, writing and updating sequential data sets and partitioned data set members. For additional information refer to the QSAM definition in this glossary> or http://www.simotime.com/indexsam.htm>
Basic Telecommunications Access Method	BTAM	An access method that permits read and write communication with remote devices
Basic Telecommunications Access Method	BTAM	ancienne (1964) m?thode d'acc?s de t?l?communication de bas niveau
Basic Telecommunications Access Method-Extended Storage	BTAM-ES	An IBM supplied telecommunications access method that permits read and write communication with remote devices
BDAM		Basic Direct Access Method. Access method which allows the programmer to access specific blocks of data on DASD. Difficult to work with, but still supported in z/OS DFSMS for compatibility.
BISAM		Basic Indexed Sequential Access Method. Old access method that used index structures to access data on DASD.
BPAM		See basic partitioned access method
BPAM		basic partitioned access method
BPAM		Basic Partitioned Access Method. Used to read a Partitioned DataSet (PDS) at a low level, such as when you want to write a program to look at the directory of PDS members.
BSAM		basic sequential access method
BSAM		Basic Sequential Access Method. One of two access methods used to read and write sequential datasets in z/OS. A part of DFSMSdfp. See also QSAM.
BSAM		See basic sequential access method
BTAM		See Basic Telecommunications Access Method
BTAM		Basic Telecommunications Access Method. The first access method common to the predecessors of VSE/ESA and z/OS provides low-level services for reading from and writing to TP devices. Problems with the complexity of BTAM led to the evolution of TP monitors such as CICS. BTAM was largely superseded by access methods, such as VTAM, which implement the SNA procedures (BTAM does not support SNA devices). Withdrawn for VSE/ESA June 2000 and z/OS March 2000. Support ends March 2002 for both platforms.
BTAM-ES		See Basic Telecommunications Access Method-Extended Storage
direct access method		An access method used to retrieve or update particular blocks of a data set on a direct access device
generalized sequential access method	GSAM	A database access method that allows batch application programs to access a sequential data set record that is defined as a database record. This database record is handled as one unit, with no segments, fields, or hierarchical structure. Any records to be added are inserted at the end of the database. GSAM does not allow database records to be updated or deleted
GSAM		See generalized sequential access method
GSAM		Generalized Sequential Access Method. A feature of IMS.
HDAM		See hierarchical direct access method
HDAM		Hierarchical Direct Access Method for IMS DB.
HIDAM		See hierarchical indexed direct access method
HIDAM		Hierarchical Indexed Direct Access Method. Access method used in IMS DB.
hierarchical direct access method	HDAM	A database access method using algorithmic addressability to records in a hierarchic direct organization. A choice of OSAM or VSAM ESDS is available as a base for HDAM
hierarchical indexed direct access method	HIDAM	A database access method used for indexed access to records in a hierarchic direct organization. It provides indexed access to the root segments and pointer access to subordinate segments
hierarchical indexed direct access method	HIDAM	A database access method used for indexed access to records in a hierarchic direct organization. It provides indexed access to the root segments and pointer access to subordinate segments
hierarchical indexed direct access method	HIDAM	A database access method used for indexed access to records in a hierarchic direct organization. This method provides indexed access to the root segments and pointer access to subordinated segments
hierarchical indexed sequential access method	HISAM	A database access method used for indexed access to records in a hierarchic sequential organization
hierarchical sequential access method	HSAM	An IMS HS organization that is used for sequential storage and access of segments on tape or direct access storage. BSAM and QSAM are used as the basis for HSAM
HISAM		See hierarchical indexed sequential access method
HSAM		See hierarchical sequential access method
IDC Access Method Services	IDCAMS	The ``IDC'' is the IBM product code for VSAM. This utility is used to manage VSAM data sets. The REPRO function is commonly used to copy data from or to a VSAM Data Set
IDCAMS		An IBM program that is used to process access method services commands. It can be invoked as a job or jobstep, from a TSO terminal or from within a user's application program
IDCAMS		Access Method Services. Multi-purpose batch VSAM utility program under z/OS and VSE/ESA. Most IDCAMS statements are also TSO commands, though the abbreviation rules vary slightly.
indexed sequential access method	ISAM	An access method that can be used for either direct or sequential update or retrieval. An index is stored on DASD with the data set
indexed sequential access method	ISAM	m?thode d'acc?s pour fichiers sur disque fond?e sur un index
Indexed Sequential Access Method	ISAM	This was originally a method of creating and accessing indexed files that allowed record storage and retrieval by a key value within each record. The term has become generic and is commonly used to refer to any method of storing and retrieving keyed or indexed records
ISAM		See indexed sequential access method
ISAM		Indexed Sequential Access Method. Method of file access in which a stored index contains the address of a group of records. Forever in need of reorganization. Replaced by VSAM in 1973, but survives in odd backwaters. ISAM datasets cannot reside on SMS-managed volumes in z/OS.
JSAM		See JES3 spool access method
non-VSAM data set		A data set allocated and accessed using one of the following methods: basic direct access method (BDAM), basic partitioned access method (BPAM), basic indexed sequential access method (BISAM), basic sequential access method (BSAM), queued sequential access method (QSAM), or queued indexed sequential access method (QISAM)
OSAM		See overflow sequential access method
overflow sequential access method	OSAM	An IMS data management access method that combines selected characteristics of BSAM and BDAM for handling data overflow from ISAM. OSAM is used by the following IMS database access methods: HISAM, HIDAM, and HDAM if VSAM is not used. OSAM is also used by some of the online pool management routines
overflow sequential access method	OSAM	An IMS data management access method that combines selected characteristics of basic sequential access method (BSAM) and basic direct access method (BDAM) for handling data overflow from indexed sequential access method (ISAM)
partitioned HDAM	PHDAM	A partitioned Hierarchical Direct Access Method database organization, one type of High Availability Large Database (HALDB)
partitioned HDAM	PHDAM	A partitioned hierarchical direct access method (HDAM) database organization, which is one type of high availability large database (HALDB)
partitioned HIDAM	PHIDAM	A partitioned Hierarchical Indexed Direct Access Method database organization, one type of High Availability Large Database
PHDAM		See partitioned HDAM
QISAM		Queued Index Sequential Access Method. Obsolete System/360 access method replaced by VSAM KSDS.
QSAM		queued sequential access method
QSAM		Queued Sequential Access Method. One of the original OS/360 file access methods still used today in z/OS for reading and writing sequential datasets. BSAM is a less commonly used alternative.
QSAM		See queued sequential access method
QTAM		Queued Telecommunications Access Method. Obsolete telecommunications access method replaced by TCAM.
queued sequential access method	QSAM	An access method for storing and retrieving logical records in a continuous sequence. Input data blocks awaiting processing or output data blocks awaiting transfer to auxiliary storage are queued on the system to minimize delays in I/O operations
queued sequential access method	QSAM	An extended version of the basic sequential access method (BSAM). Input data blocks awaiting processing or output data blocks awaiting transfer to auxiliary storage are queued on the system to minimize delays in I/O operations
queued sequential access method	QSAM	m?thode d'acc?s fichier s?quentielle, extension de BSAM, caract?ris?e par le buffering
queued sequential access method	QSAM	An extended version of the basic sequential access method (BSAM). When this method is used, a queue of data blocks is formed. Input data blocks await processing, and output data blocks await transfer to auxiliary storage or to an output device
queued sequential access method	QSAM	An extended version of BSAM. When this method is used, a queue is formed of input data blocks awaiting processing or processed output data blocks awaiting transfer to auxiliary storage or to an output device
Queued Sequential Access Method	QSAM	A replacement or an extended version of the basic sequential access method (BSAM). With this method a queue is formed of input data blocks that are awaiting processing or of output data blocks that have been processed and are awaiting transfer to auxiliary storage or to an output device. This typically provides better performance because the application is not waiting for the physical reads or writes to and from the Input or Output devices. For additional information refer to the BSAM definition in this glossary> or http://www.simotime.com/indexsam.htm>
Queued Telecommunications Access Method	QTAM	ancienne (1963) m?thode d'acc?s de t?l?communication
SAM		See sequential access method
SAM-E		Sequential Access Method?Extended. Souped-up version of the original SAM sequential access method. The main innovation is that it supports sequential data striping. Until 1983, SAM-E was a separate software product. After being incorporated into DFP (now DFSMSdfp), SAM-E lost its name and became simply SAM. See also SAM.
sequential access method	SAM	An access method for storing, deleting, or retrieving data in a continuous sequence based on the logical order of the records in the file
SHISAM		See simple HISAM
SHSAM		See simple hierarchical sequential access method
simple hierarchical sequential access method	SHSAM	A type of HSAM database that contains only root segments, which have no prefixes
TCAM		See Telecommunications Access Method
TCAM		Telecommunications Access Method. SNA and pre-SNA software resident in the mainframe which enables applications to access devices as if they were sequential files. Now largely superseded by VTAM. Withdrawn March 2000. Support ended March 2002.
Telecommunications Access Method	TCAM	An access method used to transfer data between main storage and remote or local storage
Telecommunications Access Method	TCAM	ancienne m?thode d'acc?s de t?l?communication, destin?e alors (en 1968) ? remplacer QTAM et BTAM
USAM		See user spool access method
virtual telecommunication access method	VTAM	logiciel de t?l?communication IBM supportant SNA
Virtual Telecommunications Access Method	VTAM	An IBM licensed program that controls communication and the flow of data in an SNA network
virtual telecommunications access method	VTAM	A set of programs that maintain control of the communication between terminals and application programs running under z/OS. Now known as Communications Server - SNA Services
Virtual Telecommunications Access Method	VTAM	An IBM licensed program that controls communication and the flow of data in an SNA network (in z/OS)
Virtual Telecommunications Access Method	VTAM	An IBM licensed program that controls communication and the flow of data in a computer network. It provides single-domain, multiple-domain, and multiple-network capability. VTAM runs under MVS, OS/VS1, VM/ESA, and VSE
VSAM		virtual storage access method
VSAM		Virtual Storage Access Method (aka Very Slow And Mysterious). IBM mainframe proprietary software for direct (by key or by record number) or sequential processing of fixed and variable length records on DASD. According to IBM, VSAM gives device independence of data storage and eases migration of data to new devices. VSAM is a very powerful system if it had record locking it would almost be a database. However, according to the third-party vendors who make a living selling VSAM software, VSAM software (notably IDCAMS) is a pig to use, and users need all the help they can get. See also KSDS, RRDS, ESDS.
VSAM		See Virtual Storage Access Method
VTAM		Virtual Telecommunications Access Method
VTAM		Virtual Telecommunication Access Method. The main SNA subsystem resident in the mainframe, which manages session establishment and data flow between terminals and application programs, or between application programs. VTAM also contains the SSCP logic, and supports the execution of concurrent multiple teleprocessing applications, giving each application a logically direct connection with terminals. ACF/VTAM and the defunct ACF/VTAME were extended versions of VTAM for multi-host networks. In March 1992, IBM announced APPN for VTAM (Version 4.1), effectively sealing the lid on the coffin of subarea SNA. Multiprotocol support ?la Networking Blueprint was announced in April 1993. Today, VTAM is a component of Communications Server (CS) for z/OS. VTAM for z/VM and VSE/ESA are still separate products.
VTAM		See Virtual Telecommunications Access Method

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