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Mnesia
Mnesia is a distributed computing, distributed, real-time computing, soft real-time database management system written in the Erlang (programming language), Erlang programming language. It is distributed as part of the Open Telecom Platform. Description As with Erlang, Mnesia was developed by Ericsson for soft real-time distributed computing, distributed and high-availability computing work related to telecoms. It was not intended as a general office-based data processing database management system, nor to replace SQL-based systems. Instead Mnesia exists to support Erlang, where DBMS-like Persistence (computer science), persistence is required. It has more in common with embeddable DBMS such as Berkeley DB than with any SQL database server. Database model "Rows" in tables are represented as records that contain a key value and a data field. This data field may in turn be a tuple containing an Erlang data structure of any complexity. Backend types Mnesia has three inbuilt t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LYME (software Bundle)
LYME and LYCE are software stacks composed entirely of free and open-source software to build high-availability heavy duty dynamic web pages. The stacks are composed of: * Linux, the operating system; * Yaws, the web server; * Mnesia or CouchDB, the database; * Erlang, the functional programming language. The LYME and LYCE bundles can be and are combined with many other free and open-source software packages such as e.g. netsniff-ng for security testing and hardening, Snort, an intrusion detection (IDS) and intrusion prevention system (IPS), RRDtool for diagrams, or Nagios, Collectd, or Cacti, for monitoring. Details Both databases Mnesia and CouchDB as well as Yaws (and also Mochiweb, Misultin, and Cowboy) are written in Erlang, so web applications developed for LYME/LYCE may be run entirely in one Erlang virtual machine. This is in contrast to LAMP where the web server ( Apache) and the application (written in PHP, Perl or Python) might be in the same proces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Open Telecom Platform
OTP is a collection of useful middleware, libraries, and tools written in the Erlang programming language. It is an integral part of the open-source distribution of Erlang. The name OTP was originally an acronym for Open Telecom Platform, which was a branding attempt before Ericsson released Erlang/OTP as open source. However neither Erlang nor OTP is specific to telecom applications. The OTP distribution is supported and maintained by the OTP product unit at Ericsson, who released Erlang/OTP as open-source in the late 90s, to ensure its independence from a single vendor and to increase awareness of the language. It contains: *an Erlang interpreter (which is called ''BEAM''); *an Erlang compiler; *a protocol for communication between servers (nodes); *a CORBA Object Request Broker; *a static analysis tool called Dialyzer; *a distributed database server (Mnesia); and *many other libraries. History Early days Originally named Open System, it was started by Ericsson in late 1995 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erlang (programming Language)
Erlang ( ) is a general-purpose, concurrent, functional programming language, and a garbage-collected runtime system. The term Erlang is used interchangeably with Erlang/OTP, or Open Telecom Platform (OTP), which consists of the Erlang runtime system, several ready-to-use components (OTP) mainly written in Erlang, and a set of design principles for Erlang programs. The Erlang runtime system is designed for systems with these traits: * Distributed * Fault-tolerant *Soft real-time * Highly available, non-stop applications * Hot swapping, where code can be changed without stopping a system. The Erlang programming language has immutable data, pattern matching, and functional programming. The sequential subset of the Erlang language supports eager evaluation, single assignment, and dynamic typing. A normal Erlang application is built out of hundreds of small Erlang processes. It was originally proprietary software within Ericsson, developed by Joe Armstrong, Robert Vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LYME Software Bundle
Lyme or LYME may refer to: * Lyme disease, an infectious disease carried by ticks caused by bacteria of the genus ''Borrelia'' Places United Kingdom * Lyme, an alternative name of Lyme Handley, a civil parish in Cheshire ** Lyme Park, an estate in Cheshire * Lyme Regis, a town in Dorset commonly known as Lyme ** Lyme Bay, an area of the English Channel * Lyme Brook, tributary stream of the River Trent, Staffordshire * Forest of Lyme, a historic area of forest covering parts of Cheshire, Derbyshire, and Staffordshire United States * Lyme, Connecticut, a town in southeastern Connecticut, the namesake of Lyme disease ** Old Lyme, Connecticut, a neighboring town ** East Lyme, Connecticut, a neighboring town * Lyme, New Hampshire, a town in western New Hampshire * Lyme, New York, a town in New York along the Lake Ontario shoreline * Lyme Township, Huron County, Ohio, a small town in northern Ohio Other places * Lyme Park, Gauteng, a suburb of Johannesburg, South Africa Ships ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ericsson
(lit. "Telephone Stock Company of LM Ericsson"), commonly known as Ericsson, is a Sweden, Swedish multinational networking and telecommunications company headquartered in Stockholm. The company sells infrastructure, software, and services in information and communications technology for telecommunications service providers and enterprises, including, among others, 3G, 4G, and 5G equipment, and Internet Protocol (IP) and optical transport systems. The company employs around 100,000 people and operates in more than 180 countries. Ericsson has over 57,000 granted patents. Ericsson has been a major contributor to the development of the telecommunications industry and is one of the leaders in 5G. The company was founded in 1876 by Lars Magnus Ericsson and is jointly controlled by the Wallenberg family through its holding company Investor AB, and the universal bank Handelsbanken through its investment company Industrivärden. The Wallenbergs and the Handelsbanken sphere acquired th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Query Language
Query languages, data query languages or database query languages (DQL) are computer languages used to make queries in databases and information systems. A well known example is the Structured Query Language (SQL). Types Broadly, query languages can be classified according to whether they are database query languages or information retrieval query languages. The difference is that a database query language attempts to give factual answers to factual questions, while an information retrieval query language attempts to find documents containing information that is relevant to an area of inquiry. Other types of query languages include: * Full-text. The simplest query language is treating all terms as bag of words that are to be matched with the postings in the inverted index and where subsequently ranking models are applied to retrieve the most relevant documents. Only tokens are defined in the CFG. Web search engines often use this approach. * Boolean. A query language that also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Functional Language
In computer science, functional programming is a programming paradigm where programs are constructed by applying and composing functions. It is a declarative programming paradigm in which function definitions are trees of expressions that map values to other values, rather than a sequence of imperative statements which update the running state of the program. In functional programming, functions are treated as first-class citizens, meaning that they can be bound to names (including local identifiers), passed as arguments, and returned from other functions, just as any other data type can. This allows programs to be written in a declarative and composable style, where small functions are combined in a modular manner. Functional programming is sometimes treated as synonymous with purely functional programming, a subset of functional programming which treats all functions as deterministic mathematical functions, or pure functions. When a pure function is calle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ACID
In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a sequence of database operations that satisfies the ACID properties (which can be perceived as a single logical operation on the data) is called a ''transaction''. For example, a transfer of funds from one bank account to another, even involving multiple changes such as debiting one account and crediting another, is a single transaction. In 1983, Andreas Reuter and Theo Härder coined the acronym ''ACID'', building on earlier work by Jim Gray who named atomicity, consistency, and durability, but not isolation, when characterizing the transaction concept. These four properties are the major guarantees of the transaction paradigm, which has influenced many aspects of development in database systems. According to Gray and Reuter, the IBM In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Database Transaction
A database transaction symbolizes a unit of work, performed within a database management system (or similar system) against a database, that is treated in a coherent and reliable way independent of other transactions. A transaction generally represents any change in a database. Transactions in a database environment have two main purposes: # To provide reliable units of work that allow correct recovery from failures and keep a database consistent even in cases of system failure. For example: when execution prematurely and unexpectedly stops (completely or partially) in which case many operations upon a database remain uncompleted, with unclear status. # To provide isolation between programs accessing a database concurrently. If this isolation is not provided, the programs' outcomes are possibly erroneous. In a database management system, a transaction is a single unit of logic or work, sometimes made up of multiple operations. Any logical calculation done in a consistent mode in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Virtual Machine
In computing, a virtual machine (VM) is the virtualization/ emulation of a computer system. Virtual machines are based on computer architectures and provide functionality of a physical computer. Their implementations may involve specialized hardware, software, or a combination. Virtual machines differ and are organized by their function, shown here: * ''System virtual machines'' (also termed full virtualization VMs) provide a substitute for a real machine. They provide functionality needed to execute entire operating systems. A hypervisor uses native execution to share and manage hardware, allowing for multiple environments which are isolated from one another, yet exist on the same physical machine. Modern hypervisors use hardware-assisted virtualization, virtualization-specific hardware, primarily from the host CPUs. * Process virtual machines are designed to execute computer programs in a platform-independent environment. Some virtual machine emulators, such as QEMU and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LAMP (software Bundle)
LAMP (Linux, Apache, MySQL, PHP/Perl/Python) is an acronym denoting one of the most common software stacks for many of the web's most popular applications. However, LAMP now refers to a generic software stack model and its components are largely interchangeable. Each letter in the acronym stands for one of its four open-source building blocks: * Linux for the operating system * Apache HTTP Server * MySQL for the relational database management system * PHP, Perl, or Python programming language The components of the LAMP stack are present in the software repositories of most Linux distributions. History The acronym LAMP was coined by Michael Kunze in the December 1998 issue of ''Computertechnik'', a German computing magazine, as he demonstrated that a bundle of free and open-source software "could be a feasible alternative to expensive commercial packages". Since then, O'Reilly Media and MySQL teamed up to popularize the acronym and evangelize its use. The term and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LevelDB
LevelDB is an open-source on-disk key-value store written by Google fellows Jeffrey Dean and Sanjay Ghemawat. Inspired by Bigtable, LevelDB is hosted on GitHub under the New BSD License and has been ported to a variety of Unix-based systems, macOS, Windows, and Android. Features LevelDB stores keys and values in arbitrary byte arrays, and data is sorted by key. It supports batching writes, forward and backward iteration, and compression of the data via Google's Snappy compression library. LevelDB is not an SQL database. Like other NoSQL and dbm stores, it does not have a relational data model and it does not support SQL queries. Also, it has no support for indexes. Applications use LevelDB as a library, as it does not provide a server or command-line interface. MariaDB 10.0 comes with a storage engine which allows users to query LevelDB tables from MariaDB. History LevelDB is based on concepts from Google's Bigtable database system. The table implementation for the Bigtab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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