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database management system
Last modified: Friday, February 08, 2002 

A collection of programs that enables you to store, modify, and extract information from a database. There are many different types of DBMSs, ranging from small systems that run on personal computers to huge systems that run on mainframes. The following are examples of database applications:
  • computerized library systems
    • automated teller machines
  • flight reservation systems
    • computerized parts inventory systems

    From a technical standpoint, DBMSs can differ widely. The terms relational, network, flat, and hierarchical all refer to the way a DBMS organizes information internally. The internal organization can affect how quickly and flexibly you can extract information.

    Requests for information from a database are made in the form of a query, which is a stylized question. For example, the query

    SELECT ALL WHERE NAME = "SMITH" AND AGE > 35

    requests all records in which the NAME field is SMITH and the AGE field is greater than 35. The set of rules for constructing queries is known as a query language. Different DBMSs support different query languages, although there is a semi-standardized query language called SQL (structured query language). Sophisticated languages for managing database systems are called fourth-generation languages, or 4GLs for short.

    The information from a database can be presented in a variety of formats. Most DBMSs include a report writer program that enables you to output data in the form of a report. Many DBMSs also include a graphics component that enables you to output information in the form of graphs and charts.

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    For internet.com pages about database management system . Also check out the following links!

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    related categories

    Databases

    related terms

    aggregate function

    BLOB

    data dictionary

    data independence

    data mart

    data migration

    database

    database engine

    DB2

    distributed database

    drill down

    EAI

    ETL

    flat-file database

    fourth-generation language

    hypertext

    Informix

    ISAM

    multidimensional DBMS

    OLAP

    Oracle

    Progress Software

    query

    RDBMS

    report writer

    schema

    SQL

    stored procedure

    trigger


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