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DBMS BCA Unit-1 DBMS - Introduction The File Based System Database System vs. File Based System Limitations of File Based System Database System Components Advantages of Database Approach DBMS ARCHITECTURE Three Level Architecture of DBMS External or View Level Conceptual Level Internal or Physical Level Data Independence Physical DBMS Architecture Database Manager Database Users Database Administrator (DBA) Roles and Responsibilities of DBA Data Models The Relational Data Model The Network Data Model The Hierarchical Data Model MySQL Installation in Ubuntu


Database Users

  • Native Users
    • They are unsophisticated users who interact with the system by invoking one of the application program that have been written previously.
  • Application Programmers
    • They are computer professionals who write application programs.
      Application programmers can choose from many tools to develop user interfaces.
  • Sophisticated Users
    • They interact with the system without writing programs. Instead they write their requests in a database query language.
  • Specialized Users
    • They are sophisticated users who write specialized database applications that do not fit in to the traditional data-processing frame work.