Introduction to Database Managment System

Posted By on November 4, 2014

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Measures of Query cost
Three Level Database Architecture

Database Management Systems

  1. A database management system (DBMS), or simply a database system (DBS), consists of
    • A collection of interrelated and persistent data (usually referred to as the database (DB)).
    • A set of application programs used to access, update and manage that data (which form the data management system (MS)).
  2. The goal of a DBMS is to provide an environment that is both convenient and efficient to use in
    • Retrieving information from the database.
    • Storing information into the database.
  3. Databases are usually designed to manage large bodies of information. This involves
    • Definition of structures for information storage (data modeling).
    • Provision of mechanisms for the manipulation of information (file and systems structure, query processing).
    • Providing for the safety of information in the database (crash recovery and security).
    • Concurrency control if the system is shared by users.
Measures of Query cost
Three Level Database Architecture

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