A comprehensive, hands-on course for developers who are tired of slow queries killing their apps. You’ll learn execution plan analysis, index strategy, join optimization, subquery refactoring, partitioning, and real-world performance tuning patterns used in production Node.js backends.

This isn’t theory — every module is built around real query problems from production systems. You’ll diagnose bottlenecks, rewrite queries, benchmark results, and build the instincts to write performant SQL from the start.

What you’ll master:
• Reading and interpreting EXPLAIN / EXPLAIN ANALYZE output
• Composite index design and covering indexes
• JOIN strategies: nested loop vs hash vs merge
• Subquery elimination and CTE optimization
• Window functions for complex analytics without performance cost
• Connection pooling and query caching in Node.js
• Partitioning and sharding strategies for scale
• Locking, deadlocks, and transaction isolation tuning

Who this is for:
Backend developers, full-stack engineers, and DBAs who work with PostgreSQL, MySQL, or SQL Server and need to move beyond “it works” to “it’s fast.”