what is database,types of shared organizational database

1. Introduction to
Database Systems

2. CODE OF ETHICS
• All students must come to class on time
(Attendance will be taken in first 5 to 10 mins)
• Students should remain attentive during class and
avoid use of Mobile phone, Laptops or any gadgets
• Respect faculty and staff through actions and
speech
• Class participation is encouraged
2

3. Text Book
• Primary
• Database Systems 8E, C.J.Date, Addison Wesley Pub.
Co. (2004).
• Reference
• Database Systems: A Practical Approach to Design,
Implementation and Management 5E, R.Connolly and
P.Begg, Addison-Wesley Pub. Co (2009).
• Fundamentals of Database Systems, 5E, Elmasri and
Navathe, Addison-Wesley, ISBN: 0-201-74153-9.

4. Sequence [TodaysAgenda]
Content of Lecture
• Basic Database Concepts (Definitions)
• Different File Systems
• Database and its Advantages

5. What is a Database

6. 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.

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

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

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

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

11. Different Files Systems
• Manual File System
• Computerized File System
• Database System

12. Manual File System
• Way of managing data using:
• Pen and Paper
• Data Storage:
• Record data on paper.
• File paper away into folders and cabinets.
• Data Retrieval:
• Locate paper from cabinets and folders.
• Retrieve data from paper.
• Main disadvantages: Data collection increased by
time to time and keeping track of data becomes
much difficult.

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

14. Computerized File Processing
System
Program and Data Interdependence
Registration
Applications
Registration
Data
Files
Registration
Examination
Applications
Examination
Data
Files
Examination
Library
Applications
Library
Data
Files
Library

15. Computerized File Processing
System
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

16. Database System
A database system is a relationship between stored
data, a database, users and the hardware or
operating system used for the storage.

17. Database System
Registration
Examination
Library
Applications
Library
Examination
Applications
Registration
Applications
Database
Management
System
University
Students
Database

18. Advantages of Database
• Persistent
• Data stored in a database can usually last for a long
time
• Shared
• Data stored in a database can be simultaneously
accessed by multiple programs
• Interrelated
• Data stored in a database can be combined to produce new data

19. 19