1. Introduction to Database Processing
CH1
Introduction to Database Processing

2. DB technology: One of the hottest career paths
WWW and Internet
Enjoyable, interesting and challenging
DB design and development: art and engineering
User Requirement
DB Design
Art
Engineering
Physical
Database

3. 4 Database Examples Mary Richards House painting Treble Clef Music
Single user Database
Data table : Figure 1-1
Data Entry Form : Figure 1-2
Example report : Figure 1-3
Treble Clef Music
Multi-user DB ( LAN connection)
Figure 1-5 : a -Customer Form,
b-Rental Agreement Form,
c- Instrument Form

4. State Licensing and Vehicle Registration Bureau
52 centers:conduct drivers’ tests and issue and renew drivers’ license
37 offices: sell vehicle registrations
more than 40 different tables of data
several of which contain hundreds of thousands of row of data
Calvert Island Reservations Centre
promotional DB: stores data, photos, video, sound, events and facilities
Normal users:
employee:
customer and reservation DB

6. Comparison of DB Applications

7. The Relationship of Application Program and the DBMS
DB Application
DBMS
User DB
Design and development of Database vs.
Design and development of Database application
Overlap between DB class and System development class

8. File Processing System
Two File Processing Systems
Customer
Processing
Application
Customer
File
Customer File user
Rental
Processing
Application
Rental FIle
Rental File user

9. Limitations in File Processing System
Separated and Isolated Data
Data Duplication
Application Program Dependency
Incompatible Files
The Difficulty of Representing Data in the Users’ Perspectives: e.g. for Fig 1-5(b), several different files need to be extracted, combined, and presented together

10. Database Processing Systems
Integrated Data
Reduced Data Duplication
Program/Data Independence
Easier Representation of the Users’ Perspectives

11. Definition of A Database
A Database is Self-Describing
Metadata or Data directory or Data dictionary
Promotes Program/data independence
easy to change data structure: only change in the data dictionary
A DB is a Collection of Integrated Records
Files + Metadata + Indexes + Application Metadata (Figure 1-11)
A DB is a Model of a Model
model of the users’ model
Mary Richards’s DB is a model of the way in which Mary Richards views her business

13. The History of DB Processing
The Organizational Context
to resolve problems with the file-processing systems
At first, database applications were difficult to develop and vulnerable
By the mid-1970s, database could efficiently and reliably process organizational applications
The Relational Model
data are stored in a way that minimizes duplicated data and eliminates certain types of processing errors
Tables and relationship

14. Microcomputer DBMS Products
dBase II, dBase III Plus, dBase IV
Access, SALSA, Paradox, Revelation, MDBS, Helix
Client/Server DB Applications: (LAN)
File sharing architecture
Databases Using Internet Technology
all database applications will be delivered using HTTP, XML and related technologies
Distributed Database Processing
important in theory but have not been widely adopted
all data are spread over many computers micro, LAN server, and mainframes (communicate with one another)

15. Object Oriented DBMS (ODBMS)
Problems in security and control
Object Oriented DBMS (ODBMS)
important in theory but have not been widely used for business information systems
difficult to use
cost and risk require to convert existing database to ODBMS
most ODBMS have developed to support engineering applications
ODBMS are likely to occupy a niche in commercial information systems applications
This text focus on relational model