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Sarabjit Kumar, Lovely Professional University Unit 9: The Database Model

Unit 9: The Database Model Notes

CONTENTS

Objectives
Introduction
9.1 Concept of Database Model
9.1.1 Data Repository
9.1.2 Data Dictionary
9.1.3 Database Software
9.1.4 Data Abstraction
9.1.5 Data Access
9.2 Hierarchical Database Model
9.2.1 Parent-Child Relationships
9.2.2 Root Segment
9.2.3 Physical Pointers
9.3 Network Database Model
9.3.1 Levels
9.3.2 Record Types
9.3.3 Relationships
9.3.4 Multiple Parents
9.3.5 Physical Pointers
9.4 Relational Database Model
9.4.1 Levels
9.4.2 Relations or Tables
9.4.3 Relationships
9.4.4 No Physical Pointer
9.5 Types of Databases
9.5.1 Centralized Database
9.5.2 Distributed Database
9.6 Creating a Basic Object Model
9.6.1 Model Precisions
9.6.2 Instance Variables
9.6.3 Methods
9.6.4 Abstractness
9.7 Creating the User Interface
9.7.1 New System Design Process
9.7.2 Methodology in Action
9.8 Summary
9.9 Keywords
9.10 Review Questions
9.11 Further Readings

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