1. Lecture 9 – Database Design
Systems Development Life Cycle (SDLC) Database Life Cycle
(DBLC)

2. Lecture Objectives
Define Information System, System Analysis, System Development, and Database Development
Discuss the components of the Systems Development Life Cycle
Discuss the components of the Database Life Cycle

3. Definitions – Information Systems
Allows for data collection, storage, and retrieval
Facilitates the transformation of data into information and the management of data and information
People + Hardware + Software + Databases + Application Programs + Procedures =
INFORMATION SYSTEM

4. Definitions – Systems Analysis
Process that establishes the need and the extent for information systems
Analyzing in detail the information needs of an organization, the characteristics and components of presently utilized information systems, and the functional requirements of proposed information systems.

5. Definitions – Systems Development
Process of creating the information system
Use the results of the systems analysis to determine the requirements and hence use the requirements to develop the information system
Databases, application software, etc.

6. Definitions – Database Development
Process of database design and development
Database Design
Complete, normalized, non-redundant and fully integrated conceptual, logical, and physical database models
Database Implementation
Database storage structure, loading data, and data management

7. Systems Development Life Cycle (SDLC)
Traces the history of an information system
Split into 5 phases
Database design an essential component of the SDLC

8. Systems Development Life Cycle (SDLC)
Initial Assessment
Feasibility Study
Should the existing system be:
Continued?
Modified?
Replaced?
System Cost
Technology

9. Systems Development Life Cycle (SDLC)
User Requirements
Existing System Evaluation
Logical System Design

10. Systems Development Life Cycle (SDLC)
Detailed Specifications
Screen, menu, report layouts
Conversion from old to new

11. Systems Development Life Cycle (SDLC)
Coding
Testing
Debugging
Installation

12. Systems Development Life Cycle (SDLC)
Evaluation
Maintenance
System Errors
Business Changes
Enhancements

13. Database Life Cycle (DBLC)
Traces the history of the creation of a database
Split into 6 phases

14. Database Life Cycle (DBLC)
Analyze company situation
Define Problem and Constraints
Define Objectives
Define Scope and Boundaries

15. Database Life Cycle (DBLC)
Conceptual Design
ER-Diagram / Normalization
DBMS Software Selection
Create the Logical Design
Create the Physical Design

16. Database Life Cycle (DBLC)
Install the selected DBMS
Create the databases
Load the data / Convert from Old System

17. Database Life Cycle (DBLC)
Test the Database
Fine-Tune the Database
Evaluate the Database and its Application Programs

18. Database Life Cycle (DBLC)
Produce the required information flow
Alternate form of testing

19. Database Life Cycle (DBLC)
Changes to the System (from operation, bugs, business changes)
Enhancements

20. Life Cycle Effectiveness
DOCUMENTATION