Chapter 7: Indexes and Performance
Chapter 7 of 15
Chapter 7: Indexes and Performance
7.1 Understanding Indexes
Indexes improve query performance by creating fast lookup structures.
Index Types:
- PRIMARY KEY - Automatically indexed
- UNIQUE INDEX - Ensures uniqueness
- INDEX - General purpose index
- FULLTEXT INDEX - For text search
7.2 Creating Indexes
-- Create index
CREATE INDEX idx_email ON users(email);
-- Create composite index
CREATE INDEX idx_name_email ON users(username, email);7.3 Query Optimization
Optimize queries for better performance.
Optimization Tips:
- Use EXPLAIN to analyze queries
- Add indexes on frequently queried columns
- Avoid SELECT * when possible
- Use LIMIT for large result sets