© Virtual University of Pakistan

In the name of Allah

© Virtual University of Pakistan Database Management Systems Lecture - 1

© Virtual University of Pakistan Course Objectives  Introduction to Very basics  Guides through Different  design stages  Familiarize with a tool  Emphasis on  Design stages of Databases

© Virtual University of Pakistan Importance of Course

© Virtual University of Pakistan Lecture Overview Database Definition Comparison with the prior Data Processing approach Pros & Cons of Databases

© Virtual University of Pakistan What is a Database

© Virtual University of Pakistan Database Def-1 A database is a shared collection of logically related data that is stored to meet the requirements of different users of an organization

© Virtual University of Pakistan A database is a self-describing collection of integrated records Database Def-2

© Virtual University of Pakistan A database models a particular real world system in the computer in the form of data Database Def-3

© Virtual University of Pakistan The concept of a shared organizational database Accounting Accounts Payable Accounts Receivable Management ControlPlanning Manufacturing ProductionScheduling Marketing Product Development Sales Corporate Database

© Virtual University of Pakistan A bit of History Computer initially used for computational/ engineering purposes Commercial applications introduced File Processing System

© Virtual University of Pakistan File Processing System A collection of programs that perform services for the end-users such as production of reports

© Virtual University of Pakistan File Processing Systems Program and Data Interdependence Registration Applications Registration Data Files Registration Examination Applications Examination Data Files Examination Library Applications Library Data Files Library

© Virtual University of Pakistan Fine Books Issued Father Name Name Reg_Number Library Grade Semester Class Address Name Reg_Number Examination Class Address Phone Father Name Name Reg_Number Registration File Processing Systems Duplication of Data Vulnerable to Inconsistency

© Virtual University of Pakistan Advantages of Database Approach Registration Examination Library Applications Library Examination Applications Registration Applications Database Management System University Students Database - Data Sharing- Data Independence - Controlled Redundancy- Better Data Integrity First Lecture Ends