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Encyclopedia results for Database

  1. Database

    refimprove date December 2011 condense date November 2011 A database is an organized collection of data ... general, and is independent of the technology used. The term database may be narrowed to specify particular aspects of organized collection of data and may refer to the logical database, to physical database as data content in computer data storage or to many other database sub definitions. The term database is correctly applied to the data and their supporting data structures, and not to the database management system referred to by the acronym DBMS . The database data collection with DBMS is called a database system . The term database system implies that the data is managed to some level ... often implies the use of a general purpose database management system DBMS . ref name Ullman Jeffrey Ullman and Jennifer widom 1997 First course in database systems , Prentice Hall Inc., Simon & Schuster ... depend on databases for their operations. Well known DBMSs include Oracle Database Oracle , IBM DB2 , Microsoft SQL Server , PostgreSQL , MySQL and SQLite . A database is not generally Software portability ... as many end user s as needed. The design, construction, and maintenance of a complex database requires specialist skills the staff performing these functions are referred to as database application programmer s and database administrator s. Their tasks are supported by tools provided either as part of the DBMS or as stand alone software products. These tools include specialized database language ... database commands. Database languages are generally specific to one data model , and in many cases they are specific to one DBMS type. The most widely supported database language is SQL , which has ... Database concept The database concept has evolved since the 1960s to ease increasing difficulties ... end users, and with a diverse large amount of data . It has evolved together with database management systems which enable the effective handling of databases. Though the terms database and DBMS ...   more details



  1. Protein database

    Protein database may refer to Any protein structure database Any protein sequence database Exact names Protein NIH Protein database of the National Institute of Health Protein Database of Bio Synthesis, Inc. disambig ...   more details



  1. Database (disambiguation)

    wiktionarypar Database Database may refer to Database , central article discussing the organised collection of data Springfield Elementary School Students Database Database , a character on The Simpsons Bibliographic database , in libraries, a collection of bibliographic information on a particular topic Glass database , a collection of glass compositions and related properties disambig ...   more details



  1. Database state

    Database state may refer to Database state, in database technology the set of stored data. Entering, modifying, or deleting information changes the database state. A state that practices Mass surveillance . disambig ...   more details



  1. Database machine

    A database machine or back end processor is a computer or special hardware that stores and retrieves data from a database . It is specially designed for database access and is coupled to the main front end computer s by a high speed channel. This contrasts with a database server , which is a computer in a local area network that holds a database. The database machine is tightly coupled to the main CPU , whereas the database server is loosely coupled via the network. An example is the IBM System 38 . Database FOLDOC Category History of computing Category Databases compu hardware stub ...   more details



  1. NMR database

    NMR database NMR nuclear magnetic resonance may refer to NMR spectra database , a collection of NMR spectra for a large number of compounds NMR database method , a strategy to identify the stereochemistry of certain chiral compounds dab ...   more details



  1. OpenEdge Database

    The Openedge Database is a relational database with some growing Object capabilities . It was formerly known as the Progress RDBMS. see also Progress Software Corporation OpenEdge Advanced Business Language database software stub Category Proprietary database management systems ...   more details



  1. Centralized database

    A Centralized database is a database located and maintained in one location, unlike a distributed database . One main advantage is that all data is located in one place. The disadvantage is that bottlenecks may occur. database stub web stub Category Types of databases ...   more details



  1. Negative database

    A negative database , in Credit Card terms, refers to a list of Credit Card owners who chargeback a lot. Negative databases are usually maintained by Credit Card companies. The term negative database also refers to a security concept in database terms where contrary to traditional databases, such database saves attributes that cannot be associated with a certain entry. http sigfpe.blogspot.com 2006 10 negative databases.html http www.economist.com science displayStory.cfm?story id 7854216 Database Category Credit cards Category Data security Category Databases econ stub database stub ...   more details



  1. Database refactoring

    Refimprove date May 2009 A database refactoring is a simple change to a database schema that improves its design while retaining both its behavioral and informational semantics. A database refactoring is conceptually more difficult than a code refactoring code refactorings only need to maintain behavioral semantics while database refactorings also must maintain informational semantics. ref Scott Ambler and Pramod Sadalage 2006 . Refactoring databases Evolutionary database design . Addison Wesley. ISBN 978 0321293534 ref The process of database refactoring is the act of applying database refactorings to evolve an existing database schema database refactoring is a core practice of evolutionary database design . You refactor a database schema for one of two reasons to develop the schema in an evolutionary manner in parallel with the evolutionary design of the rest of your system or to fix design problems with an existing legacy database schema Database refactoring does not change the way data is interpreted or used and does not fix computer bug bug s or add new functionality. Every single refactoring to a database leaves the system in a working state, thus not causing maintenance lags, provided the meaningful data exists in the production environment. An example of database refactoring would be splitting an aggregate table into two different tables in the process of database normalization Tools LiquiBase See also Database testing Refactoring Test driven development Unit testing References Reflist External links http www.infoq.com presentations ambler database refactoring Database refactoring presentation at InfoQ.com by Scott W. Ambler http www.agiledata.org essays databaseRefactoring.html The Process of Database Refactoring by Scott W. Ambler http www.agiledata.org essays databaseRefactoringCatalog.html Catalog of Database Refactorings . by Scott W. Ambler. http www.databaserefactoring.com Database Refactoring Website by Pramod Sadalage Database Category Extreme programming ...   more details



  1. Lexical database

    A lexical database is a lexical resource which has an associated software environment database which permits access to its contents. The database may be custom designed for the lexical information or a general purpose database into which lexical information has been entered. Information typically stored in a lexical database database includes lexical category and synonyms of words, as well as semantic relations between different words or sets of words. See also Machine readable dictionary WordNet External links http wordnet.princeton.edu The WordNet Home Page database stub Category Lexical databases Category Translation databases ar ...   more details



  1. Online database

    An online database is a database accessible from a network, including from the Internet . It differs from a local database, held in an individual computer or its attached storage, such as a CD. For the system or software designed to manage a database, see Database management system s DBMS For information on the structure of a database itself, see Database For information on the programs for searching a database, see Search engine s Currently, there are several database products designed specifically as hosted databases delivered as Software as a Service products. These differ from typical traditional databases such as Oracle, Microsoft SQL Server, Sybase, etc. Some of the differences are These online databases are delivered primarily via a web browser They are often purchased by a monthly subscription They embed common collaboration features such as sharing, email notifications, etc. For information on the contents of specific types of database, see Bibliographic database s Customer relationship management To learn about generic online databases that can be used by any software application, see Cloud database . See also List of online databases List of search engines List of academic databases and search engines References Unreferenced date October 2009 DEFAULTSORT Online Database Category Online databases Category Types of databases compu network stub ...   more details



  1. Diseases Database

    The Diseases Database is a database that underlies a free website that provides information about the relationships between medical conditions, symptoms , and medications . The database is run by Medical ... Organization The Diseases Database is based around a collection of concepts related to human medicine .... These are referred to as items . There are around 8,000 items within the database. ref http www.diseasesdatabase.com ... resources three sets of metadata are modelled within the database. Firstly Diseases Database ... heart disease . More formally the database employs an entity attribute value model with items ... infarction . Such relationships aggregate within the database and allow lists to be retrieved ... infarction. Secondly most Diseases Database items are assigned topic specific hyperlinks to Web ... Diseases Database items are mapped to concepts within the Unified Medical Language System UMLS . UMLS ... for the majority of items on the database. The UMLS map also enables links to and from other medical classifications and terminologies e.g. ICD 9 and SNOMED . Diseases Database content can thus potentially ... concept code for Myocardial infarction 22298006 finds the equivalent Diseases Database item http ... Diseases Database References Reflist Category Bioinformatics Category Medical literature Category Medical databases med org stub ar az Diseases Database be Diseases Database bs Diseases Database ca Diseases Database cy Cronfa ddata o Afiechydon et Diseases Database es Diseases Database fa fr Diseases Database gl Diseases Database ko id Diseases Database he Diseases Database jv Diseases Database nl Diseases Database no Diseases Database pl Diseases Database pt Diseases Database ru Diseases Database sr Diseases Database sv Diseases Database ta tr Hastal k Veri Taban uk Diseases Database ur vi Diseases Database zh ...   more details



  1. Database system

    morereferences date October 2008 A database system is a term that is typically used to encapsulate the constructs of a data model , database Management system DBMS and database . ref Beynon Davies P. 2004 . Database Systems 3rd Edition. Palgrave, Basingstoke, UK. ISBN 1 4039 1601 2 ref A database is an organised pool of logically related data. Data is stored within the data structures of the database. A DBMS is a suite of computer software providing the interface between users and a database or databases. A DBMS is a shell which surrounds a database or series of databases and through which all interactions take place with the database. The interactions catered for by most existing DBMS fall into four main groups Data Definition. Defining new data structures for a database, removing data structures from the database, modifying the structure of existing data. Data Maintenance. Inserting new data into existing data structures, updating data in existing data structures, deleting data from existing data structures. Data Retrieval. Querying existing data by end users and extracting data for use by application programs. Data Control. Creating and monitoring users of the database, restricting access to data in the database and monitoring the performance of databases. Both a database and its DBMS conform to the principles of a particular data model. ref Tsitchizris, D. C. and F. H. Lochovsky 1982 . Data Models. Englewood Cliffs, Prentice Hall. ref Data models include the Hierarchical model hierarchical data model , the Network model network data model , the Relational model relational data model and the Object database object oriented data model . See also Heterogeneous Database System References reflist Database models DEFAULTSORT Database System Category Database management systems ko ru ...   more details



  1. Basis database

    unreferenced date November 2011 Basis database or OpenText Collections Server is a database produced by Open Text Corporation . External Links http www.opentext.com 2 global products products library and collection management products opentext collections server.htm Open Text Corporation product website database software stub Category Databases ...   more details



  1. Database theory

    Database theory encapsulates a broad range of topics related to the study and research of the theoretical realm of database s and database management system s. Theoretical aspects of data management include, among other areas, the foundations of query languages, computational complexity and expressive power of queries, finite model theory , database design theory, dependency theory database theory dependency theory , foundations of concurrency control and database recovery , deductive database s, temporal database temporal and spatial database s, real time database s, managing uncertain data and probabilistic database s, and Web data. Most research work has traditionally been based on the relational model , since this model is usually considered the simplest and most foundational model of interest. Corresponding results for other data models, such as object oriented or semi structured model s, or, more recently, graph data models and XML , are often derivable from those for the relational model. A central focus of database theory is on understanding the complexity and power of query languages and their connection to logic . Starting from relational algebra and first order logic which are equivalent by Codd s theorem and the insight that important queries such as graph reachability are not expressible in this language, more powerful language based on logic programming and fixpoint logic such as datalog were studied. Another focus was on the foundations of query optimization and data integration . Here most work studied conjunctive query conjunctive queries , which admit query ... in the area are the ACM Symposium on Principles of Database Systems PODS and the International Conference on Database Theory ICDT . References Serge Abiteboul , Richard B. Hull , Victor Vianu ... query Expressive power Database DEFAULTSORT Database Theory Category Database management systems Category Database theory lv Datu b u teorija tr Veritaban kuram zh ...   more details



  1. Active database

    An Active Database is a database that includes an event driven architecture often in the form of Event Condition Action ECA rules which can respond to conditions both inside and outside the database. Possible uses include security monitoring, alerting, statistics gathering and authorization. Most modern relational databases include active database features in the form of Database trigger SQL Triggers . See also Event driven architecture References cite journal last Paton first Norman W coauthors D az, Oscar title Active database systems journal ACM Computing Surveys year 1999 volume 31 issue 1 pages 63 103 doi 10.1145 311531.311623 url http portal.acm.org citation.cfm?id 311623 accessdate 8 July 2010 publisher ACM location NY, USA issn 0360 0300 Use dmy dates date October 2010 DEFAULTSORT Active Database Category Types of databases Database stub ...   more details



  1. Spatiotemporal database

    A spatiotemporal database is a database that manages both space and time information. Common examples include Tracking of moving objects, which typically can occupy only a single position at a given time. A database of wireless communication networks, which may exist only for a short timespan within a geographic region. An index of species in a given geographic region, where over time additional species may be introduced or existing species migrate or die out. Historical tracking of plate tectonic activity. Spatiotemporal databases are an extension of spatial database spatial databases . A spatiotemporal database embodies spatial, temporal database temporal , and spatiotemporal database concepts, and captures spatial and temporal aspects of data and deals with geometry changing over time ref http wis.cs.ucla.edu cchen thesis.ps Data Models and Query Languages of Spatio Temporal Information Bot generated title ref and or location of objects moving over invariant geometry. ref RTLS ref Organizations http vldb.org Very Large Databases http www.dexa.org Database and Expert Systems Applications See also Data warehouse Data mining , Database mining , Data farming Locating engine References Reflist Category Database management systems Category Geolocation Category Wireless locating Category Spatial databases Category Temporal databases database stub ...   more details



  1. Database engine

    unreferenced date August 2007 A database engine or storage engine is the underlying software component that a database management system DBMS uses to create, read, update and delete CRUD data from a database . Most database management systems include their own application programming interface API that allows the user to interact with their underlying engine without going through the user interface of the DBMS. Many of the modern DBMS support multiple database engines within the same database. For example, MySQL supports InnoDB as well as MyISAM . Some database engines are Database transaction transactional . class wikitable Name Free Transactional Aria storage engine Aria GPL No BlitzDB GPL No Falcon storage engine Falcon GPL Yes InnoDB GPL Yes MyISAM GPL No XtraDB GPL Yes See also Aria storage engine Architecture of Btrieve Micro Kernel Database Engine Btrieve s Micro Kernel Database Engine Berkeley DB c tree c treeACE Database Engine FLAIM Database Engine InnoDB Microsoft Jet Database Engine MyISAM MySQL Cluster , on the NDB storage engine of MySQL External links http dev.mysql.com tech resources articles storage engine part 3.html DEFAULTSORT Database Engine Category Data management Category Database management systems database stub az Baza veril nl rin proqramla d rma dill ri fr Moteur de base de donn es lv Datub zes dzin js ja pt Mecanismo de armazenamento ru Database engine ...   more details



  1. Database administrator

    Wikify date September 2011 A database administrator short form DBA is a person responsible for the design, implementation, maintenance and repair of an organization s database . ref http education.oracle.com ... mcdba.aspx Microsoft Certified Database Administrator MCDBA Retrieved 18 June, 2011. ref They are also known by the titles Database Coordinator or Database Programmer , and is closely related to the Database Analyst , Database Modeller , Programmer Analyst , and Systems Manager . The role includes the development and design of database strategies, monitoring and improving database performance ... security measures to safeguard the database. ref cite web url http www.acs.org.au ictcareers index.cfm?action show&conID 200707200948211895 title Database Administrator publisher ICT Careers Portal Australian Computer Society ref Employing organizations may require that a database administrator have a certification or degree for database systems for example, the Microsoft Certified Database Administrator ref name MSDBA . Some organizations have a hierarchical level of database administrators ... Manager Director of Database Administration Information Technology Skills ref cite web url http web.ebscohost.com.libdb.njit.edu ... 40sessionmgr10&vid 4 title Database Administrator? DBA publisher Prakken Publications ref Strong ... Duties A database administrator s activities can be listed as below ref cite web url http www.developer.com db article.php 718491 What Is a Database Administrator.htm title What is a Database ... Database Administrator DBA.html title Database Administrator DBA publisher BusinessDictionary.com ref Transferring Data Replicating Data Maintaining database and ensuring its availability to users Maintaining the data dictionary Controlling privileges and permissions to database users Monitoring database performance. Database security Stop. Data fragmentation Give authority to access data base to the authorized person. References Reflist Database DEFAULTSORT Database Administrator Category ...   more details



  1. Database catalog

    The database catalog of a database instance consists of metadata in which definitions of database Object file object s such as base tables, views virtual tables , synonym s, value ranges, index database indexes , User computing users , and user groups are stored. ref citebook title Systems Development Handbook author Paul C. Tinnirello year 1999 publisher CRC Press isbn 0849398223 ref ref cite title CREATE VIEW Transact SQL in SQL Server 2008 Books Online publisher Microsoft Corporation url http msdn.microsoft.com en us library ms187956.aspx ref The SQL standard specifies a uniform means to access the catalog, called the INFORMATION SCHEMA, but not all databases follow this, even if they implement other aspects of the SQL standard. For an example of database specific metadata access methods, see Oracle metadata . References refs Category Database theory database stub ko ...   more details



  1. Daffodil database

    notability Products date September 2010 Daffodil DB is a SQL 99 & JDBC 3.0 compliant 100 Java platform Java relational database management system . It has enterprise level features such as full text search , PSM, database trigger trigger s, etc. It is available in both Embedded & Network editions. Daffodil DB also has an open source version named One DB . External links http www.daffodildb.com Java Database Daffodil DB database software stub Category Java platform software Category Java enterprise platform Category Relational database management systems ...   more details



  1. Current database

    A current database is a conventional database that stores data that is valid now . For example, if a user inserts John Smith into the Staff table of a current database, this asserts that the fact is valid now and until it is subsequently deleted. By contrast, a temporal database qualifies each row with a valid time stamp , valid time period or valid time interval . For example, we can assert the fact that John Smith was a member of staff during the period 1 June 2001 and now . Current databases are the most common type of database in use today. The concept of now is discussed in Clifford et alia 1997 . External links cite doi 10.1145 249978.249980 Category Types of databases ...   more details



  1. Database dump

    Unreferenced date March 2007 For information on obtaining the Wikipedia database, see Wikipedia Database download . A database dump contains a record of the Table database table structure and or the data from a database and is usually in the form of a list of SQL statements. A database dump is most often used for backup backing up a database so that its contents can be restored in the event of data loss . Data corruption Corrupted databases can often be recovered by analysis of the dump. Database dumps are often published by free software and free content projects, to allow reuse or Fork software development forking of the database. Example source lang sql Database CREATE DATABASE example USE example Table structure for table users CREATE TABLE users id int 8 unsigned NOT NULL AUTO INCREMENT, username varchar 16 NOT NULL, password varchar 16 NOT NULL, PRIMARY KEY id Data for table users INSERT INTO users VALUES 1, alice , secret , 2, bob , secret source See also Core dump Databases Database management system References Empty section date July 2010 External links http dev.mysql.com doc refman 5.0 en mysqldump.html mysqldump A Database Backup Program http www.postgresql.org docs 8.2 interactive backup dump.html PostgreSQL dump backup methods , for PostgreSQL databases. databases Category Database administration tools database stub de Datenbankdump ...   more details



  1. Database testing

    2011 Database s are the collection of files which are interconnected. Databases at different ... and integration errors may occur in large database systems which is not feasible from the point of view of system s performance, reliability, consistency and security.So in order to obtain database which satisfy ACID properties of database management system , we need to test it, so the term database testing comes in a picture. ref name Database cite book last Korth first Henry title Database System Concepts year 2010 publisher Macgraw Hill isbn 0073523321, 9780073523323 ref Purposes of database testing Basically, database testing is a layered process. It consists of four layers namely User interface layer, Business layer, data access layer and database. Testing at these different layers is important for consistent database. Many of system and web soft wares access databases from different ... with interface design of database, Business layer includes databases supporting business strategies ... process. Database testing mainly takes place at this layer which includes our further testing ... first Scott title Agile database Techniques effective strategies for the agile software developer ..., consistent, isolated and durable database. The points why we need database testing are as follows ... the database operations such as insert,delete,update are preformed without testing database for its consistency,then whole database may crash. Some companies have different types database, have different ... test some databases which is not so effective. So in this case database developers will face some difficulties ... the separate database testing team is needed. Database testing is mainly deals with the finding defect ... based software. Something different should be done in order to tolerate with database crash, broken insertion, deletion or update. So Database refactoring is evolutionary technique to deals with it. Types ... in database testing The figure indicates the areas of testings that need to be tested during database ...   more details




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