Mrs.Vasanthi Muniasamy M.Sc., M.Phil

Department Of Information Systems

King Khalid University

DATABASE MANAGEMENT DATABASE MANAGEMENT SYSTEMSYSTEM

Lecture #4Lecture #4

BASIC CONCEPTSBASIC CONCEPTS

1. What is a database?1. What is a database?

A database is a collection of data which can be used: A database is a collection of data which can be used: • alone, or alone, or • combined to other data combined to other data

to provide answers to the user’s question.to provide answers to the user’s question.

2. What is a Database Management System?2. What is a Database Management System?

A DBMS is a collection of programs whichA DBMS is a collection of programs which

• provide management of databases provide management of databases

• control access to datacontrol access to data

• contain a query language to retrieve information contain a query language to retrieve information

easily easily

3. Database Design3. Database Design

It is important to design the database in such a way that:It is important to design the database in such a way that:

• A specific item can be reached easily A specific item can be reached easily

• The database can respond to the user’s different questions The database can respond to the user’s different questions

easily easily

•The database occupies minimum storage spaceThe database occupies minimum storage space

•The database contains no unnecessary dataThe database contains no unnecessary data

• Data can be added and updated easily without causing Data can be added and updated easily without causing

mistakes mistakes

DatabaseDatabase :: Collection of TablesCollection of Tables

TableTable : : Collection of RecordsCollection of Records

RecordRecord : : Collection of FieldsCollection of Fields

FieldsFields : : Collection of DataCollection of Data

DataData : : Piece of InformationPiece of Information

GLOSSARY OF TERMSGLOSSARY OF TERMS

PARTS OF A TABLEPARTS OF A TABLE

Reg. No Name Address

111 Tony Abha

222 Rosy Khamis

Reg. No Sex Course

111 Male IIT

222 Female MBA

RecordsRecords

RecordsRecords

FieldsFieldsDataData

THANK YOU