A database management system (DBMS) is computer software designed for the purpose of managing databases based on a variety of data models. Software redirects here. ... This article is principally about managing and structuring the collections of data held on computers. ... A data model is a model that describes how data are represented and used in an abstract way. ...

Description

A Data Base Management System is a complex set of software programs that controls the organization, storage, management, and retrieval of data in a database. DBMS are categorized according to their data structures or types, some time DBMS is also known as Data base Manager. It is a set of prewritten programs that are used to store, update and retrieve a Database. A DBMS includes: 1. A modeling language to define the schema of each database hosted in the DBMS, according to the DBMS data model. In mathematics, a set can be thought of as any collection of distinct objects considered as a whole. ... A computer program (often simply called a program) is an example of computer software that prescribes the actions (computations) that are to be carried out by a computer. ... For other uses, see Organization (disambiguation). ... This article does not cite any references or sources. ... Information retrieval (IR) is the science of searching for information in documents, searching for documents themselves, searching for metadata which describe documents, or searching within databases, whether relational stand-alone databases or hypertextually-networked databases such as the World Wide Web. ... For other uses, see Data (disambiguation). ... This article is principally about managing and structuring the collections of data held on computers. ... In computer science, data modeling is the process of creating a data model by applying a data model theory to create a data model instance. ... A Logical schema is a data model of a specific problem domain that has more detail than a conceptual schema, but does not include the design considerations and physical storage parameters found in a physical schema. ... This article is principally about managing and structuring the collections of data held on computers. ... A data model is a model that describes how data are represented and used in an abstract way. ...

2.* The four most common types of organizations are the hierarchical, network, relational and object models. Inverted lists and other methods are also used. A given database management system may provide one or more of the four models. The optimal structure depends on the natural organization of the application's data, and on the application's requirements (which include transaction rate (speed), reliability, maintainability, scalability, and cost). In a hierarchical data model, data are organized into a tree-like structure. ... The network model is a database model conceived as a flexible way of representing objects and their relationships. ... The relational model for database management is a database model based on predicate logic and set theory. ... In the computing discipline object model has two related but distinct meanings: 1. ...

3.* The dominant model in use today is the ad hoc one embedded in SQL, despite the objections of purists who believe this model is a corruption of the relational model, since it violates several of its fundamental principles for the sake of practicality and performance. Many DBMSs also support the Open Database Connectivity API that supports a standard way for programmers to access the DBMS. SQL (IPA: or ) is a computer language designed for the retrieval and management of data in relational database management systems, database schema creation and modification, and database object access control management. ... In computing, Open Database Connectivity (ODBC) provides a standard software API method for using database management systems (DBMS). ... API redirects here. ... A programmer or software developer is someone who programs computers, that is, one who writes computer software. ...

4. Data structures (fields, records, files and objects) optimized to deal with very large amounts of data stored on a permanent data storage device (which implies relatively slow access compared to volatile main memory). A binary tree, a simple type of branching linked data structure. ... Digital permanence addresses the history and development of digital storage techniques specifically quantifying the expected lifetime of data stored on various digital media and the factors which influence the permanence of digital data. ... A data storage device is a device for recording (storing) information (data). ... This article does not cite any references or sources. ... Primary storage, or internal memory, is computer memory that is accessible to the central processing unit of a computer without the use of computers input/output channels. ...

5. A database query language and report writer to allow users to interactively interrogate the database, analyze its data and update it according to the users privileges on data. Database query languages are like programming languages. ... In computing, privilege is defined as the delegation of authority over a system. ...

6.It also controls the security of the database. For other uses, see Security (disambiguation). ...

7.*Data security prevents unauthorized users from viewing or updating the database. Using passwords, users are allowed access to the entire database or subsets of it called subschemas. For example, an employee database can contain all the data about an individual employee, but one group of users may be authorized to view only payroll data, while others are allowed access to only work history and medical data. Data security is the means of ensuring that data is kept safe from corruption and that access to it is suitably controlled. ...

8.*If the DBMS provides a way to interactively enter and update the database, as well as interrogate it, this capability allows for managing personal databases. However, it may not leave an audit trail of actions or provide the kinds of controls necessary in a multi-user organization. These controls are only available when a set of application programs are customized for each data entry and updating function.

9. A transaction mechanism, that ideally would guarantee the ACID properties, in order to ensure data integrity, despite concurrent user accesses (concurrency control), and faults (fault tolerance). A database transaction is a unit of interaction with a database management system or similar system that is treated in a coherent and reliable way independent of other transactions. ... For other uses, see acid (disambiguation). ... In computer science and telecommunications, the term data integrity has the following meanings: The condition in which data is identically maintained during any operation, such as transfer, storage, and retrieval. ... The Dining Philosophers, a classic problem involving concurrency and shared resources In computer science, concurrency is a property of systems in which several computational processes are executing at the same time, and potentially interacting with each other. ... In computer science -- more specifically, in the field of databases -- concurrency control is a method used to ensure that database transactions are executed in a safe manner (i. ... In computer science, Fault-tolerance is the property of a computer system to continue operation at an acceptable quality, despite the unexpected occurrence of hardware or software failures. ...

10.It also maintains the integrity of the data in the database. In computer science and telecommunications, the term data integrity has the following meanings: The condition in which data is identically maintained during any operation, such as transfer, storage, and retrieval. ...

11.The DBMS can maintain the integrity of the database by not allowing more than one user to update the same record at the same time. The DBMS can help prevent duplicate records via unique index constraints; for example, no two customers with the same customer numbers (key fields) can be entered into the database. See ACID properties for more information (Redundancy avoidance). For other uses, see acid (disambiguation). ...

The DBMS accepts requests for data from the application program and instructs the operating system to transfer the appropriate data. An operating system (OS) is a software that manages computer resources and provides programmers with an interface used to access those resources. ...

When a DBMS is used, information systems can be changed much more easily as the organization's information requirements change. New categories of data can be added to the database without disruption to the existing system. It has been suggested that this article or section be merged with Information systems. ...

Organizations may use one kind of DBMS for daily transaction processing and then move the detail onto another computer that uses another DBMS better suited for random inquiries and analysis. Overall systems design decisions are performed by data administrators and systems analysts. Detailed database design is performed by database administrators.

Database servers are specially designed computers that hold the actual databases and run only the DBMS and related software. Database servers are usually multiprocessor computers, with RAID disk arrays used for stable storage. Connected to one or more servers via a high-speed channel, hardware database accelerators are also used in large volume transaction processing environments. A database server is a computer program that provides database services to other computer programs or computers, as defined by the client-server model; the term may also refer to a computer dedicated to running such a program. ... Multiprocessing is traditionally known as the use of multiple concurrent processes in a system as opposed to a single process at any one instant. ... In computing, a redundant array of inexpensive disks, also later known as redundant array of independent disks (commonly abbreviated RAID) is a system which uses multiple hard drives to share or replicate data among the drives. ...

DBMSs are found at the heart of most database applications. Sometimes DBMSs are built around a private multitasking kernel with built-in networking support although nowadays these functions are left to the operating system. A database is an information set with a regular structure. ... In computing, multitasking is a method by which multiple tasks, also known as processes, share common processing resources such as a CPU. In the case of a computer with a single CPU, only one task is said to be running at any point in time, meaning that the CPU is... In computer science, the kernel is the fundamental part of an operating system. ... A computer network is an interconnected group of computers. ... An operating system (OS) is a software that manages computer resources and provides programmers with an interface used to access those resources. ...

Logical view and physical view

A database management system provides the ability for many different users to share data and process resources. But as there can be many different users, there are many different database needs. The question now is: How can a single, unified database meet the differing requirement of so many users?

A DBMS minimizes these problems by providing two views of the database data: a physical view and a logical view. The physical view deals with the actual, physical arrangement and location of data in the direct access storage devices(DASDs). Database specialists use the physical view to make efficient use of storage and processing resources. Users, however, may wish to see data differently from how they are stored, and they do not want to know all the technical details of physical storage. After all, a business user is primarily interested in using the information, not in how it is stored. The logical view/user’s view, of a database program represents data in a format that is meaningful to a user and to the software programs that process those data. That is, the logical view tells the user, in user terms, what is in the database. One strength of a DBMS is that while there is only one physical view of the data, there can be an endless number of different logical views. This feature allows users to see database information in a more business-related way rather than from a technical, processing viewpoint. Thus the logical view refers to the way user views data, and the physical view to the way the data are physically stored and processed.

DBMS benefits

• Improved strategic use of corporate data
• Reduced complexity of the organization’s information systems environment
• Reduced data redundancy and inconsistency
• Enhanced data integrity
• Application-data independence
• Improved security
• Reduced application development and maintenance costs
• Improved flexibility of information systems
• Increased access and availability of data and information
• Logical & Physical data independence

Features and capabilities of DBMS

A DBMS can be characterized as an "attribute management system" where attributes are small chunks of information that describe something. For example, "colour" is an attribute of a car. The value of the attribute may be a color such as "red", "blue" or "silver".

Alternatively, and especially in connection with the relational model of database management, the relation between attributes drawn from a specified set of domains can be seen as being primary. For instance, the database might indicate that a car that was originally "red" might fade to "pink" in time, provided it was of some particular "make" with an inferior paint job. Such higher arity relationships provide information on all of the underlying domains at the same time, with none of them being privileged above the others. In logic, mathematics, and computer science, the arity (synonyms include type, adicity, and rank) of a function or operation is the number of arguments or operands that the function takes. ...

Throughout recent history specialized databases have existed for scientific, geospatial, imaging, document storage and like uses. Functionality drawn from such applications has lately begun appearing in mainstream DBMSs as well. However, the main focus there, at least when aimed at the commercial data processing market, is still on descriptive attributes on repetitive record structures.

Thus, the DBMSs of today roll together frequently-needed services or features of attribute management. By externalizing such functionality to the DBMS, applications effectively share code with each other and are relieved of much internal complexity. Features commonly offered by database management systems include:

Query ability

Querying is the process of requesting attribute information from various perspectives and combinations of factors. Example: "How many 2-door cars in Texas are green?"

A database query language and report writer allow users to interactively interrogate the database, analyze its data and update it according to the users privileges on data. It also controls the security of the database. Data security prevents unauthorized users from viewing or updating the database. Using passwords, users are allowed access to the entire database or subsets of it called subschemas. For example, an employee database can contain all the data about an individual employee, but one group of users may be authorized to view only payroll data, while others are allowed access to only work history and medical data. If the DBMS provides a way to interactively enter and update the database, as well as interrogate it, this capability allows for managing personal databases. However it may not leave an audit trail of actions or provide the kinds of controls necessary in a multi-user organization. These controls are only available when a set of application programs are customized for each data entry and updating function.

Backup and replication

Copies of attributes need to be made regularly in case primary disks or other equipment fails. A periodic copy of attributes may also be created for a distant organization that cannot readily access the original. DBMS usually provide utilities to facilitate the process of extracting and disseminating attribute sets.

When data is replicated between database servers, so that the information remains consistent throughout the database system and users cannot tell or even know which server in the DBMS they are using, the system is said to exhibit replication transparency.

Rule enforcement

Often one wants to apply rules to attributes so that the attributes are clean and reliable. For example, we may have a rule that says each car can have only one engine associated with it (identified by Engine Number). If somebody tries to associate a second engine with a given car, we want the DBMS to deny such a request and display an error message. However, with changes in the model specification such as, in this example, hybrid gas-electric cars, rules may need to change. Ideally such rules should be able to be added and removed as needed without significant data layout redesign.

Security

Often it is desirable to limit who can see or change which attributes or groups of attributes. This may be managed directly by individual, or by the assignment of individuals and privileges to groups, or (in the most elaborate models) through the assignment of individuals and groups to roles which are then granted entitlements.

Computation

There are common computations requested on attributes such as counting, summing, averaging, sorting, grouping, cross-referencing, etc. Rather than have each computer application implement these from scratch, they can rely on the DBMS to supply such calculations.all arithmatical work to perform by computer is called a computation.

Change and access logging

Often one wants to know who accessed what attributes, what was changed, and when it was changed. Logging services allow this by keeping a record of access occurrences and changes.

Automated optimization

If there are frequently occurring usage patterns or requests, some DBMS can adjust themselves to improve the speed of those interactions. In some cases the DBMS will merely provide tools to monitor performance, allowing a human expert to make the necessary adjustments after reviewing the statistics collected.

Meta-data repository

Main article: Metadata

Metadata (also spelled meta-data) is data describing data. For example, a listing that describes what attributes are allowed to be in data sets is called "meta-information". The meta-data is also known as data about data. Metadata is data about data. ... Metadata is data about data. ... A data set (or dataset) is a collection of data, usually presented in tabular form. ...

History of DBMS Databases have been in use since the earliest days of electronic computing. Unlike modern systems which can be applied to widely different databases and needs, the vast majority of older systems were tightly linked to the custom databases in order to gain speed at the expense of flexibility. Originally DBMSs were found only in large organizations with the computer hardware needed to support large data sets. This article is about the machine. ...

Navigational DBMS

As computers grew in capability, this trade-off became increasingly unnecessary and a number of general-purpose database systems emerged; by the mid-1960s there were a number of such systems in commercial use. Interest in a standard began to grow, and Charles Bachman, author of one such product, IDS, founded the Database Task Group within CODASYL, the group responsible for the creation and standardization of COBOL. In 1971 they delivered their standard, which generally became known as the Codasyl approach, and soon there were a number of commercial products based on it available. The 1960s decade refers to the years from the beginning of 1960 to the end of 1969. ... Charles W. Bachman is a prominent computer scientist, particularly in the area of databases. ... Integrated Data Store (IDS) is a network database largely used by industry for its performance. ... CODASYL (often spelt Codasyl) is an acronym for COnference on DAta SYstems Languages. This was a IT industry consortium formed in 1959 to guide the development of a standard programming language that could be used on many computers. ... COBOL (pronounced //) is a Third-generation programming language, and one of the oldest programming languages still in active use. ... Year 1971 (MCMLXXI) was a common year starting on Friday (link will display full calendar) of the 1971 Gregorian calendar, known as the year of cyclohexanol. ...

The Codasyl approach was based on the "manual" navigation of a linked data set which was formed into a large network. When the database was first opened, the program was handed back a link to the first record in the database, which also contained pointers to other pieces of data. To find any particular record the programmer had to step through these pointers one at a time until the required record was returned. Simple queries like "find all the people in Sweden" required the program to walk the entire data set and collect the matching results. There was, essentially, no concept of "find" or "search". This might sound like a serious limitation today, but in an era when the data was most often stored on magnetic tape such operations were too expensive to contemplate anyway. In computer science, a database record is a description of a single item as stored in a database. ... It has been suggested that Software pointer be merged into this article or section. ... Compact audio cassette Magnetic tape is a non-volatile storage medium consisting of a magnetic coating on a thin plastic strip. ...

IBM also had their own DBMS system in 1968, known as IMS. IMS was a development of software written for the Apollo program on the System/360. IMS was generally similar in concept to Codasyl, but used a strict hierarchy for its model of data navigation instead of Codasyl's network model. International Business Machines Corporation (IBM, or colloquially, Big Blue) (NYSE: IBM) (incorporated June 15, 1911, in operation since 1888) is headquartered in Armonk, New York, USA. The company manufactures and sells computer hardware, software, and services. ... Information Management System (IMS) is a joint hierarchical database and information management system. ... The Apollo program was a human spaceflight program undertaken by NASA during the years 1961 – 1975 with the goal of conducting manned moon landing missions. ... System/360 Model 65 operators console, with register value lamps and toggle switches (middle of picture) and emergency pull switch (upper right). ...

Both concepts later became known as navigational databases due to the way data was accessed, and Bachman's 1973 Turing Award award presentation was The Programmer as Navigator. Navigational databases incorporate both the network model and hierarchical model of database interfaces. ... The A.M. Turing Award is given annually by the Association for Computing Machinery to a person selected for contributions of a technical nature made to the computing community. ...

IMS is classified as a hierarchical database. IDS and IDMS (both CODASYL databases) as well as CINCOMs TOTAL database are classified as network databases. In a hierarchical data model, data are organized into a tree-like structure. ... IDMS (Integrated Database Management System) is a (network) CODASYL database management system first developed at B.F. Goodrich and later marketed by Cullinane Database Systems (renamed Cullinet in 1983). ... The network model is a database model conceived as a flexible way of representing objects and their relationships. ...

Relational DBMS

Edgar Codd worked at IBM in San Jose, California, in one of their offshoot offices that was primarily involved in the development of hard disk systems. He was unhappy with the navigational model of the Codasyl approach, notably the lack of a "search" facility which was becoming increasingly useful. In 1970, he wrote a number of papers that outlined a new approach to database construction that eventually culminated in the groundbreaking A Relational Model of Data for Large Shared Data Banks.^[1] Edgar F. Ted Codd (August 23, 1923 - April 18, 2003) was a British computer scientist who made seminal contributions to the theory of relational databases. ... International Business Machines Corporation (IBM, or colloquially, Big Blue) (NYSE: IBM) (incorporated June 15, 1911, in operation since 1888) is headquartered in Armonk, New York, USA. The company manufactures and sells computer hardware, software, and services. ... For other uses, see San José. Nickname: Location of San Jose within Santa Clara County, California Location of San Jose with the state of California Coordinates: , Country State County Santa Clara Pueblo founded November 29, 1777 Incorporated March 27, 1850 Government  - Type charter city, mayor-council  - Mayor Chuck Reed  - Vice... Typical hard drives of the mid-1990s. ...

In this paper, he described a new system for storing and working with large databases. Instead of records being stored in some sort of linked list of free-form records as in Codasyl, Codd's idea was to use a "table" of fixed-length records. A linked-list system would be very inefficient when storing "sparse" databases where some of the data for any one record could be left empty. The relational model solved this by splitting the data into a series of normalized tables, with optional elements being moved out of the main table to where they would take up room only if needed. In computer science, a linked list is one of the fundamental data structures, and can be used to implement other data structures. ... In relational databases, SQL databases, and flat file databases, a table is a set of data elements (values) that is organized using a model of horizontal rows and vertical columns. ...

In the relational model, related records are linked together with a "key".

For instance, a common use of a database system is to track information about users, their name, login information, various addresses and phone numbers. In the navigational approach all of these data would be placed in a single record, and unused items would simply not be placed in the database. In the relational approach, the data would be normalized into a user table, an address table and a phone number table (for instance). Records would be created in these optional tables only if the address or phone numbers were actually provided. Relational Model for databases, highlighting the Key. ... Relational Model for databases, highlighting the Key. ...

Linking the information back together is the key to this system. In the relational model, some bit of information was used as a "key", uniquely defining a particular record. When information was being collected about a user, information stored in the optional (or related) tables would be found by searching for this key. For instance, if the login name of a user is unique, addresses and phone numbers for that user would be recorded with the login name as its key. This "re-linking" of related data back into a single collection is something that traditional computer languages are not designed for. In database design, a primary key is a value that can be used to identify a unique row in a table. ...

Just as the navigational approach would require programs to loop in order to collect records, the relational approach would require loops to collect information about any one record. Codd's solution to the necessary looping was a set-oriented language, a suggestion that would later spawn the ubiquitous SQL. Using a branch of mathematics known as tuple calculus, he demonstrated that such a system could support all the operations of normal databases (inserting, updating etc.) as well as providing a simple system for finding and returning sets of data in a single operation. SQL (IPA: or ) is a computer language designed for the retrieval and management of data in relational database management systems, database schema creation and modification, and database object access control management. ... This article may be too technical for most readers to understand. ...

Codd's paper was picked up by two people at Berkeley, Eugene Wong and Michael Stonebraker. They started a project known as INGRES using funding that had already been allocated for a geographical database project, using student programmers to produce code. Beginning in 1973, INGRES delivered its first test products which were generally ready for widespread use in 1979. During this time, a number of people had moved "through" the group — perhaps as many as 30 people worked on the project, about five at a time. INGRES was similar to System R in a number of ways, including the use of a "language" for data access, known as QUEL — QUEL was in fact relational, having been based on Codd's own Alpha language, but has since been corrupted to follow SQL, thus violating much the same concepts of the relational model as SQL itself. Michael Stonebraker is a computer scientist specializing in database research and development. ... Ingres (pronounced ingress) is a commercially supported, open-source relational database management system. ... System R is a database system built as a research project at IBM San Jose Research (now IBM Almaden Research Center) in the 1970s. ... QUEL is a relational database access language, similar in most ways to SQL, but somewhat better arranged and easier to use. ...

IBM itself did only one test implementation of the relational model, PRTV, and a production one, Business System 12, both now discontinued. Honeywell did MRDS for Multics, and now there are two new implementations: Alphora Dataphor and Rel. All other DBMS implementations usually called relational are actually SQL DBMSs. PRTV (Peterlee Relational Test Vehicle [1,2]) was the worlds first relational database management system that could handle significant data volumes -- it was really a relational query system as it had very powerful query facilities, but very limited update facility and no simultaneous multiuser facility. ... Business System 12, or simply BS12, was one of was the first fully relational database management systems, designed and implemented by IBMs UK Bureau Service subsidiary. ... Honeywell Heating Specialties Company Stock Certificate dated 1924 signed by Mark C. Honeywell - courtesy of Scripophily. ... Multics (Multiplexed Information and Computing Service) was an extraordinarily influential early time-sharing operating system. ... Rel may mean: Rel, the category of sets and relations Rel, a database management system rel, an HTML attribute for indicating a semantic link relpats-eht, a discontinued online riddle and the screenname of its creator REL, a file format generated by Microsofts M80 and Digital Researchs RMAC...

In 1968, the [2] University of Michigan began development of the Micro DBMS relational database management system. It was used to manage very large data sets by the US Department of Labor, the Environmental Protection Agency and researchers from University of Alberta, the University of Michigan and Wayne State University. It ran on mainframe computers using Michigan Terminal System. The system remained in production until 1996. Micro was one of the earliest relational database management systems. ... MTS is an operating system for IBM System/360 and its successors that was developed jointly by the following institutions: University of Michigan Wayne State University Simon Fraser University University of Alberta University of British Columbia Rensselaer Polytechnic Institute Durham University University of Newcastle-upon-Tyne Popular programs developed for...

SQL DBMS

IBM started working on a prototype system loosely based on Codd's concepts as System R in the early 1970s — unfortunately, System R was conceived as a way of proving Codd's ideas unimplementable^{[citation needed]}, and thus the project was delivered to a group of programmers who were not under Codd's supervision, never understood his ideas fully and ended up violating several fundamentals of the relational model. The first "quickie" version was ready in 1974/5, and work then started on multi-table systems in which the data could be broken down so that all of the data for a record (much of which is often optional) did not have to be stored in a single large "chunk". Subsequent multi-user versions were tested by customers in 1978 and 1979, by which time a standardized query language, SQL, had been added. Codd's ideas were establishing themselves as both workable and superior to Codasyl, pushing IBM to develop a true production version of System R, known as SQL/DS, and, later, Database 2 (DB2). System R is a database system built as a research project at IBM San Jose Research (now IBM Almaden Research Center) in the 1970s. ... Year 1974 (MCMLXXIV) was a common year starting on Tuesday (link will display full calendar) of the 1974 Gregorian calendar. ... Year 1978 (MCMLXXVIII) was a common year starting on Sunday (link displays the 1978 Gregorian calendar). ... Query languages are computer languages used to make queries into databases and information systems. ... SQL (IPA: or ) is a computer language designed for the retrieval and management of data in relational database management systems, database schema creation and modification, and database object access control management. ... DB2 is one of IBMs lines of relational database management system (or, as IBM now calls it, data server) software products within IBMs broader Information Management Software line. ...

Many of the people involved with INGRES became convinced of the future commercial success of such systems, and formed their own companies to commercialize the work but with an SQL interface. Sybase, Informix, NonStop SQL and eventually Ingres itself were all being sold as offshoots to the original INGRES product in the 1980s. Even Microsoft SQL Server is actually a re-built version of Sybase, and thus, INGRES. Only Larry Ellison's Oracle started from a different chain, based on IBM's papers on System R, and beat IBM to market when the first version was released in 1978. Sybase Inc. ... Informix is a family of relational database management system products from IBM, acquired in 2001 from a company (also called Informix or Informix Software) which dates its origins back to 1980. ... NonStop SQL is a relational database product originally produced at Tandem Computers using the pioneering Ingres source code from University of California, Berkeley. ... Ingres (pronounced ingress) is a commercially supported, open-source relational database management system. ... Microsoft SQL Server is a relational database management system (RDBMS) produced by Microsoft. ... Lawrence Larry Joseph Ellison (born August 17, 1944) is an American entrepreneur and the co-founder and CEO of Oracle Corporation, a major enterprise software company and is the 11th richest person in the world [1] // Ellison was born in New York City to Florence Spellman, a 19-year-old... The term Oracle database may refer either to the database management system (DBMS) software released by Oracle Corporation as Oracle RDBMS, or to any of the individual databases managed by such software. ...

Stonebraker went on to apply the lessons from INGRES to develop a new database, Postgres, which is now known as PostgreSQL. PostgreSQL is primarily used for global mission critical applications (the .org and .info domain name registries use it as their primary data store, as do many large companies and financial institutions). PostgreSQL is a free software object-relational database management system (ORDBMS), released under a BSD-style license. ...

In Sweden, Codd's paper was also read and Mimer SQL was developed from the mid-70s at Uppsala University. In 1984, this project was consolidated into an independent enterprise. In the early 1980s, Mimer introduced transaction handling for high robustness in applications, an idea that was subsequently implemented on most other DBMS. Mimer SQL is an SQL-based relational database management system from the Swedish company Mimer Information Technology AB (formerly: Upright Database Technology AB), which has been developed and produced since the 1970s. ... The Neo-Renaissance main University building in the University Park, Uppsala (designed by Herman Teodor Holmgren and completed in 1887). ...

List of Database Management Systems

Examples of DBMSs include:

The term Oracle database may refer either to the database management system (DBMS) software released by Oracle Corporation as Oracle RDBMS, or to any of the individual databases managed by such software. ... DB2 is one of IBMs lines of relational database management system (or, as IBM now calls it, data server) software products within IBMs broader Information Management Software line. ... Adaptive Server Enterprise (ASE) is Sybase Corporations flagship relational database management system product. ... FileMaker Pro is a cross-platform database application from FileMaker Inc. ... Firebird (sometimes called FirebirdSQL) is a relational database management system offering many ANSI SQL-2003 features. ... Ingres (pronounced ingress) is a commercially supported, open-source relational database management system. ... Informix is a family of relational database management system products from IBM, acquired in 2001 from a company (also called Informix or Informix Software) which dates its origins back to 1980. ... Microsoft Office Access, previously known as Microsoft Access, is a relational database management system from Microsoft that combines the relational Microsoft Jet Database Engine with a graphical user interface and software development tools. ... Microsoft SQL Server is a relational database management system (RDBMS) produced by Microsoft. ... Visual FoxPro is a data-centric object-oriented and procedural programming language produced by Microsoft. ... MySQL (pronounced (IPA) , my S-Q-L[1]) is a multithreaded, multi-user SQL database management system (DBMS)[2] which has, according to MySQL AB, more than 10 million installations. ... PostgreSQL is a free software object-relational database management system (ORDBMS), released under a BSD-style license. ... This article is being considered for deletion in accordance with Wikipedias deletion policy. ... SQLite is a mostly ACID-compliant relational database management system contained in a relatively small (~500kb) C programming library. ... An editor has expressed a concern that the subject of the article does not satisfy the notability guideline or one of the following guidelines for inclusion on Wikipedia: Biographies, Books, Companies, Fiction, Music, Neologisms, Numbers, Web content, or several proposals for new guidelines. ... The current version of the article or section reads like an advertisement. ...

See also

A column-oriented DBMS is a database management system (DBMS) which stores its content by column rather than by row. ... A data warehouse is the main repository of an organizations historical data, its corporate memory. ... Database-centric architecture is a term that has several distinct meanings, all of which relate to software architectures in which databases play a crucial role. ... A directory service (DS) is a software application — or a set of applications — that stores and organizes information about a computer networks users and network resources, and that allows network administrators to manage users access to the resources. ... According to Elmasri and Navathe (2004, p. ... In a hierarchical data model, data are organized into a tree-like structure. ... Navigational databases incorporate both the network model and hierarchical model of database interfaces. ... The network model is a database model conceived as a flexible way of representing objects and their relationships. ... In the computing discipline object model has two related but distinct meanings: 1. ... In an object database (also object oriented database), information is represented in the form of objects as used in object-oriented programming. ... An object-relational database (ORD) or object-relational database management system (ORDBMS) provides a relational database management system that allows developers to integrate a database with their own custom data-types and methods. ... // A real-time database is a processing system designed to handle workloads whose state is constantly changing (Buchmann). ... The Associative Model of Data is a data model which, it is claimed, offers numerous advantages over the current industry-leading relational database technology used in the largest percentage of modern database systems. ... The relational model for database management is a database model based on predicate logic and set theory. ... A relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd. ... Run Book Automation Stemming from the world of computer operations, a run book is a written set of standard operating procedures for the operation of the systems or networks by an administrator or operator. ... The following tables compare general and technical information for a number of relational database management systems. ... SQL (IPA: or ) is a computer language designed for the retrieval and management of data in relational database management systems, database schema creation and modification, and database object access control management. ...

References

1. ^ [1] Codd, E.F. (1970). "A Relational Model of Data for Large Shared Data Banks". Communications of the ACM 13 (6): 377–387.

External references

• Databases Information link broken

• DB2 Tutorial
• [3] Association for Computing Machinery SIGIR Forum archive Volume 7 , Issue 4
• [4] The origins of the data base concept, early DBMS systems including IDS and IMS, the Data Base Task Group, and the hierarchical, network and relational data models are discussed in Thomas Haigh, "'A Veritable Bucket of Facts:' Origins of the Data Base Management System," ACM SIGMOD Record 35:2 (June 2006).
• [5] How Database Systems Share Storage

This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL. A data model is not just a way of structuring data: it also defines a set of operations that can be performed on the data. ... Database normalization, sometimes referred to as canonical synthesis, is a technique for designing relational database tables to minimize duplication of information and, in so doing, to safeguard the database against certain types of logical or structural problems, namely data anomalies. ... Database tables/indexes are typically stored in memory or on hard disk in one of many forms, ordered/unordered Flat files, ISAM, Heaps, Hash buckets or B+ Trees. ... According to Elmasri and Navathe (2004, p. ... An example of a database that has not enforced referential integrity. ... Relational algebra, an offshoot of first-order logic, is a set of relations closed under operators. ... The relational calculus refers to the two calculi, the tuple calculus and the domain calculus, that are part of the relational model for databases and that provide a declarative way to specify database queries. ... A relational database is a database that conforms to the relational model, and refers to a databases data and schema (the databases structure of how those data are arranged). ... A relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd. ... The relational model for database management is a database model based on predicate logic and set theory. ... An object-relational database (ORD) or object-relational database management system (ORDBMS) provides a relational database management system that allows developers to integrate a database with their own custom data-types and methods. ... In computer science, transaction processing is information processing that is divided into individual, indivisible operations, called Each transaction must succeed or fail as a complete unit; it cannot remain in an intermediate state. ... This article is principally about managing and structuring the collections of data held on computers. ... For other uses, see acid (disambiguation). ... The Greek lowercase omega (ω) character is historically used by academics to represent Null in relational databases. ... In the relational model a candidate key of a relation variable (relvar) is a set of attributes of that relvar such that (1) at all times it holds in the relation assigned to that variable that there are no two distinct tuples with the same values for these attributes and... In the context of relational databases, a foreign key is a referential constraint between two tables[1]. The foreign key identifies a column or a set of columns in one (referencing) table that refers to a column or set of columns in another (referenced) table. ... In database design, a primary key is a value that can be used to identify a unique row in a table. ... A superkey is defined in the relational model as a set of attributes of a relation variable (relvar) for which it holds that in all relations assigned to that variable there are no two distinct tuples (rows) that have the same values for the attributes in this set. ... A surrogate key is a unique primary key generated by the relational database management system that is not derived from any data in the database and whose only significance is to act as the primary key. ... A database trigger is procedural code that is automatically executed in response to certain events on a particular table in a database. ... In database theory, a view is a virtual or logical table composed of the result set of a query. ... In relational databases, SQL databases, and flat file databases, a table is a set of data elements (values) that is organized using a model of horizontal rows and vertical columns. ... In database packages, the term cursor refers to a control structure for the successive traversal (and potential processing) of records in a result set as returned by a query. ... In in the field of databases in computer science, a transaction log (also database log or binary log) is a history of actions executed by a database management system to guarantee ACID properties over crashes or hardware failures. ... A database transaction is a unit of interaction with a database management system or similar system that is treated in a coherent and reliable way independent of other transactions. ... A database index is a data structure that improves the speed of operations in a table. ... A stored procedure is a subroutine available to applications accessing a relational database system. ... A partition is a division of a logical database or its constituting elements into distinct independent parts. ... SQL (IPA: or ) is a computer language designed for the retrieval and management of data in relational database management systems, database schema creation and modification, and database object access control management. ... An SQL SELECT statement returns a result set of records from one or more tables. ... A SQL INSERT statement adds one or more records to a table in a relational database. ... An UPDATE statement in SQL changes data in one or more records in a relational database management system. ... Wikipedia does not have an article with this exact name. ... An SQL DELETE statement removes one or more records from a table. ... A JOIN clause in SQL combines records from two tables in a relational database and results in a new (temporary) table, also called a joined table. Structured Query Language (SQL:2003) specifies two types of joins: inner and outer. ... In SQL the UNION operator combines the results of two SQL queries into a single table of all matching rows. ... A CREATE statement in SQL creates an object inside of a relational database management system (RDBMS). ... A DROP statement in SQL removes an object from a relational database management system (RDBMS). ... It has been suggested that this article or section be merged into Database transaction. ... A COMMIT statement in SQL ends a transaction within a relational database management system (RDBMS) and makes all changes visible to other users. ... In database technologies, a rollback is an operation which returns the database to some previous state. ... The Truncate statement removes all the data from a table. ... An ALTER statement in SQL changes the properties of an object inside of a relational database management system (RDBMS). ... A relational database is a database that conforms to the relational model, and refers to a databases data and schema (the databases structure of how those data are arranged). ... A simple diagram depicting conversion of a CSV-format flat file database table into a relational database table. ... A deductive database system is a database system which can make deductions (ie: infer additional rules or facts) based on rules and facts stored in the (deductive) database. ... A dimensional database is one which, rather than representing data in multiple relations (as a relational database does), represents key data entities as different dimensions. ... In a hierarchical data model, data are organized into a tree-like structure. ... The network model is a database model conceived as a flexible way of representing objects and their relationships. ... In an object database (also object oriented database), information is represented in the form of objects as used in object-oriented programming. ... An object-relational database (ORD) or object-relational database management system (ORDBMS) provides a relational database management system that allows developers to integrate a database with their own custom data-types and methods. ... A temporal database is a database management system with built-in time aspects, e. ... An XML database is a data persistence software system that allows data to be imported, accessed and exported in the XML format. ... In computer science -- more specifically, in the field of databases -- concurrency control is a method used to ensure that database transactions are executed in a safe manner (i. ... A data dictionary is a set of metadata that contains definitions and representations of data elements. ... JDBC is an API for the Java programming language that defines how a client may access a database. ... In computing, Open Database Connectivity (ODBC) provides a standard software API method for using database management systems (DBMS). ... Query languages are computer languages used to make queries into databases and information systems. ... The query optimizer is a component of database management system that is used to analyzes queries submitted to database server for execution, and then determines the optimal way to execute the query. ... A query plan (or query execution plan) is an set of steps used to access information in a SQL relational database management system. ... The following is a list of object-oriented database management systems. ... This article or section is not written in the formal tone expected of an encyclopedia article. ... See DBMS for a shorter list of “typical”, representative database management systems. ... The following tables compare general and technical information for a number of relational database management systems. ... This article does not cite any references or sources. ... “GFDL” redirects here. ...