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Multivalue Model
A MultiValue database is a type of NoSQL and multidimensional database, typically considered synonymous with PICK, a database originally developed as the Pick operating system. MultiValue databases include commercial products from Rocket Software, Revelation, InterSystems, Northgate Information Solutions, ONgroup, and other companies. These databases differ from a relational database in that they have features that support and encourage the use of attributes which can take a list of values, rather than all attributes being single-valued. They are often categorized with MUMPS within the category of post-relational databases, although the data model actually pre-dates the relational model. Unlike SQL-DBMS tools, most MultiValue databases can be accessed both with or without SQL. History Don Nelson designed the MultiValue data model in the early to mid-1960s. Dick Pick, a developer at TRW, worked on the first implementation of this model for the US Army in 1965. Pick considered th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NoSQL
A NoSQL (originally referring to "non- SQL" or "non-relational") database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relational databases. Such databases have existed since the late 1960s, but the name "NoSQL" was only coined in the early 21st century, triggered by the needs of Web 2.0 companies. NoSQL databases are increasingly used in big data and real-time web applications. NoSQL systems are also sometimes called Not only SQL to emphasize that they may support SQL-like query languages or sit alongside SQL databases in polyglot-persistent architectures. Motivations for this approach include simplicity of design, simpler "horizontal" scaling to clusters of machines (which is a problem for relational databases), finer control over availability and limiting the object-relational impedance mismatch. The data structures used by NoSQL databases (e.g. key–value pair, wide column, graph, or document ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microdata Corporation
Microdata Corporation was an American minicomputer company which created the Reality product line featuring the Pick operating system. In its history, Microdata * was taken over by its international distributor CMC Leasings (December 1969), * which in turn was taken over in 1983 by McDonnell Douglas Corporation (March 1983), * that division was spun off as McDonnell Douglas Information Systems (1993) * which became part of Northgate Information Solutions (April 2000). * which was acquired by NEC in 2018 and rebranded to NEC Software Solutions UK in 2021. The company was initially formed as a hardware company. Independently, TRW, in fulfillment of a mid-1960s US government contract to build software to track inventory, developed a database system named Generalized Information Retrieval Language System (GIRLS). As a public domain item, a developer named Richard Pick was free to use it as the basis of a subsequent work, which eventually became the Pick operating system. The in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Databases
In computing, a database is an organized collection of data stored and accessed electronically. Small databases can be stored on a file system, while large databases are hosted on computer clusters or cloud storage. The design of databases spans formal techniques and practical considerations, including data modeling, efficient data representation and storage, query languages, security and privacy of sensitive data, and distributed computing issues, including supporting concurrent access and fault tolerance. A database management system (DBMS) is the software that interacts with end users, applications, and the database itself to capture and analyze the data. The DBMS software additionally encompasses the core facilities provided to administer the database. The sum total of the database, the DBMS and the associated applications can be referred to as a database system. Often the term "database" is also used loosely to refer to any of the DBMS, the database system or an applicat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
InterSystems Caché
InterSystems Caché ( ) is a commercial operational database management system from InterSystems, used to develop software applications for healthcare management, banking and financial services, government, and other sectors. Customer software can use the database with object and SQL code. Caché also allows developers to directly manipulate its underlying data structures: hierarchical arrays known as M technology. Description Internally, Caché stores data in multidimensional arrays capable of carrying hierarchically structured data. These are the same “global” data structures used by the MUMPS programming language, which influenced the design of Caché, and are similar to those used by MultiValue (also known as PICK) systems. In most applications, however, object and/or SQL access methods are used. Caché ObjectScript, Caché Basic or T-SQL can be used to develop application business logic. External interfaces include native object binding for C++, Java, EJB, Activ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OpenQM
OpenQM is a MultiValue database originally developed by Ladybridge Systems in the United Kingdom and subsequently acquired by Zumasys. The primary product architect is Martin Phillips. OpenQM history OpenQM was first developed in 1993 as an in-house embedded database. It was released as a full featured runtime and development environment in 2001, initially for Windows and subsequently for Linux. Although primarily a commercial product, an open-source General Public Licence version was released in 2004 for Linux to allow developers to experiment with ideas for possible inclusion in the commercial product. In late 2008, a community-driven site formed to direct a fork of the GPL release named ScarletDME. The original open source implementation was deprecated. In 2015, Ladybridge Systems announced that cloud solutions provider Zumasys in Irvine, California, was appointed as the worldwide distributor for the OpenQM MultiValue database product with design and development of the softwa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rocket U2
Rocket U2 is a suite of database management (DBMS) and supporting software now owned by Rocket Software. It includes two MultiValue database platforms: ''UniData'' and ''UniVerse''.'U2 Product Family' Rocket Software Both of these products are s which run on current , and |
Bytecode
Bytecode (also called portable code or p-code) is a form of instruction set designed for efficient execution by a software interpreter. Unlike human-readable source code, bytecodes are compact numeric codes, constants, and references (normally numeric addresses) that encode the result of compiler parsing and performing semantic analysis of things like type, scope, and nesting depths of program objects. The name bytecode stems from instruction sets that have one-byte opcodes followed by optional parameters. Intermediate representations such as bytecode may be output by programming language implementations to ease interpretation, or it may be used to reduce hardware and operating system dependence by allowing the same code to run cross-platform, on different devices. Bytecode may often be either directly executed on a virtual machine (a p-code machine, i.e., interpreter), or it may be further compiled into machine code for better performance. Since bytecode instructions ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
