4. Advantages of Databases
• More information from
same data
• Shared data
• Balancing conflicts
among users
• Controlled redundancy
• Consistency
• Integrity
• Security
• Increased productivity
• Data independence
24. DATABASE SYSTEM LIFE CYCLE
STAGE PROCESS MODEL DATA MODEL
Initialization Report Report
Feasibility Report
High Level DFD
Process Analysis
(Business Chart)
High Level E/R Diagram
Requirements
General
DFD
High Level Dictionary
Top Down E/R
File Specifications
Requirements
Logical
DFD
Data Dictionary
File Specifications
Process Logic
Bottom Up E/R
Action Diagrams
System Design Structure Charts
Module IPO Specification
Screen/Report Layouts
Cleanup
Volume/Usage Analysis
Physical Schema
Index/Record Specs
Coding/Testing Test Plan
Logs and Documentation
Code
Implementation Installation Plan Population Plan