5.0 INTRODUCTION and 5.1 OBJECTIVES

 We all live in an age where the world is full of data and information. You must have heard of internet, which has become a huge source of information and also growing everyday. The amount of data is actually very large to access and maintain. For example, if we go to the bank to deposit or withdraw funds, if we make booking in a hotel or railways reservation, even purchasing items from a supermarket or Mall all these activities involves an automatic update of the database which keeps the inventory of the store room or showroom items.

In the traditional database applications, where most of the information was stored and accessed in either textual or numeric form. But nowadays, video clips, pictures files, weather data, satellite images and sound image files are stored in separate and specialized databases such as multimedia databases.

If your school Principal just wants to know the marks of a student named Kalpana in your class. There could be more than one Kalpana in the class, but if the data is organized in a proper manner, the information can be provided in few seconds to the Principal. To get the right data and information you must have some database accessing tools with you, so that information can be accessed and managed in a timely and effectively manner. Data must therefore be collected in an organized form so that you can get the data in very less time.

Also, in daily routine activities we come across a large number of organizations such as, University System, Airlines, Banks, Manufacturing Company etc. The functions performed by these organizations vary from one another. Accordingly data is needed to store, manage and accessed.

This unit will provide you the overview of Database Management System (DBMS), file system and its advantages including its types. Also you will learn the pictorial representation of data in the form of EntityRelationship (ER) Diagram. You will learn in detail about ER Diagrams and how to draw it.

5.1 OBJECTIVES

After going through this unit, you will be able to:

  • · describe Database Management System and File System;
  • · advantage and uses of DBMS;
  • · explain types of DBMS;
  • · explain and draw Entity Relation Diagrams (ERD); and
  • · list applications of Databases.

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