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Mainframe Sort Merge
The Sort/Merge utility is a mainframe program to sort records in a file into a specified order, merge pre-sorted files into a sorted file, or copy selected records. Internally, these utilities use one or more of the standard sorting algorithms, often with proprietary fine-tuned code. Mainframes were originally supplied with limited main memory by today's standards and the amount of data to be sorted was frequently very large. Because of this, unlike more recent sort programs, early Sort/Merge programs placed great emphasis on efficient techniques for sorting data on secondary storage, typically tape or disk. In 1968 the OS/360 Sort/Merge program provided five different "sequence distribution techniques" that could be used depending on the number and type of devices available. Historically, the "alias" SORT has been used to refer to an installation's preferred sort program, IBM's Sort/Merge, and third party Sort/Merge programs (i.e., SYNCSORT, CASORT). DFSORT is often referred ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM Mainframe Utility Programs
This article discusses support programs included in or available for OS/360 and successors. IBM categorizes some of these programs as utilities and others as service aids; the boundaries are not always consistent or obvious. Many, but not all, of these programs match the types in utility software. The following lists describe programs associated with OS/360 and successors. No DOS, TPF or VM utilities are included. Naming convention IBM uses a naming convention for modules where the first three letters identify the "component" to which a module belongs. In OS/VS, IBM renamed most of the IMx messages as AMx for OS/VS2 and HMx for OS/VS1. History/Common JCL Many of these programs were designed by IBM users, through the group SHARE, and then modified or extended by IBM from versions originally written by a user. These programs are usually invoked via Job Control Language (JCL). They tend to use common JCL DD identifiers (in the OS, now z/OS operating systems) for their d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DOS/VSE
VSEn (''Virtual Storage Extended'') is an operating system for IBM mainframe computers, the latest one in the DOS/360 lineage, which originated in 1965. It is less common than z/OS and is mostly used on smaller machines. DOS/VSE was introduced in 1979 as a successor to DOS/VS; in turn, DOS/VSE was succeeded by VSE/SP version 1 in 1983, and VSE/SP version 2 in 1985. In the late 1980s, there was a widespread perception among VSE customers that IBM was planning to discontinue VSE and migrate its customers to MVS instead, although IBM relented and agreed to continue to produce new versions of VSE. In February 2005, IBM announced z/VSE as successor to VSE/ESA 2.7, which was named to reflect the new System z branding for IBM's mainframe product line. In June 2021, 21st Century Software Inc announced that it had licensed the z/VSE source code from IBM with the intention of developing new versions of the operating system. As part of this transfer, z/VSE was renamed to VSEn. Overview DOS/ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
External Sort
External sorting is a class of sorting algorithms that can handle massive amounts of data. External sorting is required when the data being sorted do not fit into the main memory of a computing device (usually RAM) and instead they must reside in the slower external memory, usually a disk drive. Thus, external sorting algorithms are external memory algorithms and thus applicable in the external memory model of computation. External sorting algorithms generally fall into two types, distribution sorting, which resembles quicksort, and external merge sort, which resembles merge sort. External merge sort typically uses a hybrid sort-merge strategy. In the sorting phase, chunks of data small enough to fit in main memory are read, sorted, and written out to a temporary file. In the merge phase, the sorted subfiles are combined into a single larger file. Model External sorting algorithms can be analyzed in the external memory model. In this model, a cache or internal memory of siz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BatchPipes
On IBM mainframes, BatchPipes is a batch job processing utility which runs under the MVS/ESA operating system and later versions—OS/390 and z/OS. Core function In traditional processing, if data records are written out to sequential ( QSAM and BSAM) data set on disk or tape, they cannot be read concurrently by another job. The "writer" and "reader" cannot run at the same time. This is termed ''file-level interlock'' or ''data-set-level interlock''. With BatchPipes an installation can arrange for the data to be "piped" between the two jobs. The advantage is that the jobs can run concurrently and it is possible, and very usual, to avoid the time to write the data to secondary storage and to read it back. The combination of these two characteristics, if used judiciously, leads to a reduction in the combined elapsed time of the two jobs, as measured from the start of the writer job to the end of the reader job. BatchPipes maintains a ''short'' queue of records being passed bet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM Drum Storage
In addition to the drums used as main memory by IBM in, e.g., IBM 305, IBM 650, IBM offered Drum memory, drum devices as secondary storage for the IBM 700/7000 series, 700/7000 series and IBM System/360, System/360 series of computers. IBM 731 The IBM 731 is a discontinued storage unit used on the IBM 701. It has a storage capacity of 2,048 36-bit words (9,216 8-bit bytes). IBM 732 The IBM 732 is a discontinued storage unit used on the IBM 702. It has a storage capacity of 60,000 6-bit characters (45,000 8-bit bytes). IBM 733 The IBM 733 is a discontinued storage unit used on the IBM 704 and IBM 709. It has a storage capacity of 8192 36-bit words (36,864 8-bit bytes). IBM 734 The IBM 734 is a discontinued storage unit used on the IBM 705 It has a storage capacity of 60,000 6-bit characters (45,000 8-bit bytes). IBM 7320 The IBM 7320 is a discontinued storage unit manufactured by IBM announced on December 10, 1962 for the IBM 7090 and 7094 computer systems, was retained for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM 2311
IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi. Both the hard disk drive (HDD) and floppy disk drive (FDD) were invented by IBM and as such IBM's employees were responsible for many of the innovations in these products and their technologies. The basic mechanical arrangement of hard disk drives has not changed since the IBM 1301. Disk drive performance and characteristics are measured by the same standards now as they were in the 1950s. Few products in history have enjoyed such spectacular declines in cost and physical size along with equally dramatic improvements in capacity and performance. IBM manufactured 8-inch floppy disk drives from 1969 until the mid-1980s, but did not become a significant manufacturer of smaller-sized, 5.25- or 3.5-inch floppy disk drives (the dimension refers to the diameter of the floppy disk, not the size of the drive). IBM always offered its magnetic disk drives for sale but did not ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micro Focus
Micro Focus International plc was a British multinational software and information technology business based in Newbury, Berkshire, England. The firm provided software and consultancy. The company was listed on the London Stock Exchange and the New York Stock Exchange until it was acquired by the Canadian software firm OpenText in January 2023. History Micro Focus was founded by Brian Reynolds in Notting Hill in 1976. In 1981, it became the first company to win the Queen's Award for Industry purely for developing a software product. The product was CIS COBOL, a standard-compliant COBOL implementation for microcomputers. In 1998, the company acquired Intersolv, Inc., an applications enablement business, for and the combined business was renamed Merant. The same year the company acquired XDB Systems with their XDB Enterprise Server relational database management system. In 2001 the business was demerged from Merant with help from Golden Gate Capital Partners and once ag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microsoft Windows
Windows is a Product lining, product line of Proprietary software, proprietary graphical user interface, graphical operating systems developed and marketed by Microsoft. It is grouped into families and subfamilies that cater to particular sectors of the computing industry – Windows (unqualified) for a consumer or corporate workstation, Windows Server for a Server (computing), server and Windows IoT for an embedded system. Windows is sold as either a consumer retail product or licensed to Original equipment manufacturer, third-party hardware manufacturers who sell products Software bundles, bundled with Windows. The first version of Windows, Windows 1.0, was released on November 20, 1985, as a graphical operating system shell for MS-DOS in response to the growing interest in graphical user interfaces (GUIs). The name "Windows" is a reference to the windowing system in GUIs. The 1990 release of Windows 3.0 catapulted its market success and led to various other product families ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linux
Linux ( ) is a family of open source Unix-like operating systems based on the Linux kernel, an kernel (operating system), operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically package manager, packaged as a Linux distribution (distro), which includes the kernel and supporting system software and library (computing), libraries—most of which are provided by third parties—to create a complete operating system, designed as a clone of Unix and released under the copyleft GPL license. List of Linux distributions, Thousands of Linux distributions exist, many based directly or indirectly on other distributions; popular Linux distributions include Debian, Fedora Linux, Linux Mint, Arch Linux, and Ubuntu, while commercial distributions include Red Hat Enterprise Linux, SUSE Linux Enterprise, and ChromeOS. Linux distributions are frequently used in server platforms. Many Linux distributions use the word "Linux" in their name, but the Free ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unix
Unix (, ; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others. Initially intended for use inside the Bell System, AT&T licensed Unix to outside parties in the late 1970s, leading to a variety of both academic and commercial Unix variants from vendors including University of California, Berkeley ( BSD), Microsoft (Xenix), Sun Microsystems ( SunOS/ Solaris), HP/ HPE ( HP-UX), and IBM ( AIX). The early versions of Unix—which are retrospectively referred to as " Research Unix"—ran on computers such as the PDP-11 and VAX; Unix was commonly used on minicomputers and mainframes from the 1970s onwards. It distinguished itself from its predecessors as the first portable operating system: almost the entire operating system is written in the C programming language (in 1973), which allows U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CA Technologies
CA Technologies, Inc., formerly Computer Associates International, Inc., and CA, Inc., was an American multinational corporation, multinational enterprise software developer and publisher that existed from 1976 to 2018. CA grew to rank as one of the largest independent software corporations in the world, and at one point was the second largest. The company created systems software (and for a while applications software) that ran in IBM mainframe, distributed computing, virtual machine, and cloud computing environments. The company's primary founder was Charles Wang. The main key to Computer Associates' fast growth was the acquisition of many lesser-sized software companies in the IBM mainframe industry segment. CA was known for large-scale dismissals of employees in the acquired firms, and for sometimes extracting cash flow from acquired products rather than enhancing them. Customers of CA often criticized the company for its poor technical support and hostile attitude. CA und ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
