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database management system

A Dictionary of Computing | 2004 | | © A Dictionary of Computing 2004, originally published by Oxford University Press 2004. (Hide copyright information) Copyright

database management system (DBMS or dbms) A software system that provides comprehensive facilities for the organization and management of a body of information required for some particular application or group of related applications. This implies some overall logical view of the database in terms of some particular data model, and database management systems are conventionally categorized according to the data model they implement. The system will provide a database language in which schemas and subschemas (user views) can be specified and retrieval and update programs written. There will be facilities to specify and modify the storage schema, for logging, rollback, and recovery. A major objective of a DBMS is to provide data independence within the constraints of its data model. More modern DBMS provide a higher degree of data independence than earlier products where significant schema modification requires the database system to cease to be operational and for the data to be reorganized and reloaded. This can be impractical for large operational systems, a main reason for them becoming out of date and requiring redevelopment.

Well-known DBMS include the relational database systems ORACLE, INGRES, SYBASE, and INFORMIX, and the earlier systems IMS, IDMS, and ADABAS, still widely used in practice. Some of these products have versions with more limited facilities for the PC environment, for which specialist products such as Access and dBASE IV have also been developed. See also object-oriented database.

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