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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.
In the early 1970s IBM's virtual memory operating systems introduced a new file management component, VSAM, which provided similar facilities: Entry-Sequenced Datasets (ESDS) provided facilities similar to those of both sequential and BDAM datasets, since they could be read either from start to finish or directly by specifying an offset from ...
In 1972 IBM announced the first release of the OS/VS2 operating system for the IBM System 370 systems; that release later was known as Single Virtual Storage . In 1974 IBM announced release 2.0; that release and all subsequent releases became known as Multiple Virtual Storage . All releases of OS/VS2 were available to no charge because the ...
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.
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. BDAM "consists of routines used in retrieving data from, and storing data onto, direct access devices." [1]: p.5 BDAM is available on OS/360, OS/VS2, MVS, z/OS, and related high-end operating ...
Record Management Services (RMS) are procedures in the VMS, RSTS/E, RT-11 and RSX-11M operating systems that programs may call to process files and records within files. [1] [2] Its file formats and procedures are similar to of those in some IBM access methods [a] for several of its mainframe computer operating systems [b] and by other vendors for file and record management.
This article is about the MVS utility programs - it's called IBM mainframe utility programs and it starts "IBM Mainframe Utility Programs are supplied with IBM mainframe operating systems such as MVS to carry out various tasks associated with datasets etc." - and IEFBR15 isn't one of them. So I've removed the IEFBR15 entry again, and it should ...
The OS/360 and successors I/O access methods are programming APIs on the OS/360 mainframe computer operating system and its successors, such as OS/VS1, OS/VS2 (SVS), MVS, OS/390, and z/OS, used by programmers to implement input/output operations on data sets (files) and telecommunications networks.