Indexes & Performance - Concepts
Explore the key concepts of indexes & performance with practical examples and exercises.
45 min•By Priygop Team•Last updated: Feb 2026
Introduction to Indexes & Performance
In this section, we cover the fundamental aspects of indexes & performance. You'll learn core concepts, see real-world examples, and understand how to apply them in your projects.
Key Concepts
- Understanding the core principles of indexes & performance
- Practical applications and real-world use cases
- Step-by-step implementation guides
- Common patterns and best practices
- Tips for debugging and troubleshooting
- Performance optimization techniques
Indexes & Performance - Code Example
Example
-- Create Indexes
CREATE INDEX idx_employees_dept ON employees(department);
CREATE INDEX idx_orders_date ON orders(created_at DESC);
CREATE UNIQUE INDEX idx_users_email ON users(email);
-- Composite Index
CREATE INDEX idx_orders_user_date ON orders(user_id, created_at);
-- EXPLAIN query plan
EXPLAIN ANALYZE
SELECT * FROM orders
WHERE user_id = 42 AND created_at > '2024-01-01'
ORDER BY created_at DESC;Try It Yourself: Indexes & Performance
Try It Yourself: Indexes & PerformanceJavaScript⚠ 1 error
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