In the name

of

Allah

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

Importance of Course

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 models a particular real world system in the computer in the form of data

Database Def-3

The concept of a shared organizational database

Accounting

AccountsPayable

Accounts Receivable

Management

ControlPlanning

Manufacturing

ProductionScheduling

Marketing

Product DevelopmentSales

CorporateDatabase

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

Program and Data Interdependence

RegistrationApplications

RegistrationDataFiles

Registration

ExaminationApplications

ExaminationDataFiles

Examination

LibraryApplications

LibraryDataFiles

Library

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 DataVulnerable to Inconsistency

Advantages of Database Advantages of Database ApproachApproach

RegistrationExamination

LibraryApplications

Library

ExaminationApplications

RegistrationApplications

Database Management

System

University StudentsDatabase

- Data Sharing - Data Independence- Controlled Redundancy - Better Data Integrity

First Lecture Ends