Query Caching Development Tutorials, Guides & Insights

• WHERE clause: Index columns frequently used in WHERE conditions to speed up searches.
• JOIN clause: Index columns used in joins to improve join performance.
• ORDER BY clause: Index columns used in sorting to avoid sorting operations.

While indexes improve read performance, they can slow down write operations (INSERT, UPDATE, DELETE). Only create indexes on columns that benefit the most from indexing.

SELECT name, salary
FROM employees
WHERE department = 'Engineering' AND salary > 70000
ORDER BY salary DESC;

CREATE INDEX idx_dept_salary
ON employees (department, salary);