Database


 * Database**

A **database** consists of an organized collection of data for one or more multiple uses. One way of classifying **databases** involves the type of content, for example: bibliographic, full-text, numeric, image. Other classification methods start from examining [|database models] or database architectures.


 * Database management systems **

A database management system (DBMS) consists of [|software] that organizes the storage of data. A DBMS controls the creation, maintenance, and use of the database storage structures of social organizations and of their users. It allows organizations to place control of organization wide database development in the hands of Database Administrators (DBAs) and other specialists. In large systems, a DBMS allows users and other software to store and retrieve data in a structured way. Database management systems are usually categorized according to the [|database model] that they support, such as the network, relational or object model. The model tends to determine the [|query languages] that are available to access the database. One commonly used query language for the relational database is [|SQL], although SQL syntax and function can vary from one DBMS to another. A common query language for the object database is [|OQL], although not all vendors of object databases implement this, majority of them do implement this method. A great deal of the internal engineering of a DBMS is independent of the data model, and is concerned with managing factors such as performance, concurrency, integrity, and recovery from hardware failures. In these areas there are large differences between the products.

**Components of DBMS**

According to the wikibooks open-content textbooks, "[|Design of Main Memory Database System/Overview of DBMS]", most DBMS as of 2009[|[update]] implement a relational model. Other less-used DBMS systems, such as the object DBMS, generally operate in areas of application-specific data management where performance and scalability take higher priority than the flexibility of //ad hoc// query capabilities provided via the [|relational-algebra] execution algorithms of a relational DBMS.


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