Database Management Systems Waqas Arshad Cheema BS Computer engineering (uet lahore) MS CS (COMSATS LAHORE)

Database Management Systems Lecture -1

Course Objectives Introduction to Very basics Guides through Different design stages Familiarize with a tool Emphasis on Design stages of Databases.

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

What is a Database

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

A database is a self-describing collection of integrated records Database Def-2 A database is a self-describing collection of integrated records

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

The concept of a shared organizational database Management Control Planning Marketing Product Development Sales Corporate Database Accounting Accounts Payable Receivable Manufacturing Production Scheduling

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

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

File Processing Systems Library Applications Data Files Examination Applications Data Files Registration Applications Data Files Program and Data Interdependence

File Processing Systems 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 Duplication of Data Vulnerable to Inconsistency

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