Chapter 3: Database Design Fundamentals
Chapter 3 of 15
Chapter 3: Database Design Fundamentals
3.1 Database Design Principles
Good database design is crucial for application performance and maintainability.
Design Principles:
- Normalization: Eliminate data redundancy
- Data Integrity: Ensure accuracy and consistency
- Scalability: Design for growth
- Performance: Optimize for query speed
3.2 Normalization
Normalization reduces data redundancy and improves data integrity.
Normal Forms:
- 1NF: Each column contains atomic values
- 2NF: All non-key columns depend on entire primary key
- 3NF: No transitive dependencies
3.3 Entity Relationship Modeling
ER modeling helps visualize database structure and relationships.
ER Components:
- Entities (tables)
- Attributes (columns)
- Relationships (foreign keys)