SQL Query Optimization and Tuning: The End-to-End Practitioner's Guide
By Sharon Ben-Moshe · October 13, 2026 · 1 min read
Sharon Ben-Moshe is the founder of sqlfmt, a browser-based SQL formatter and validator with misspelled-keyword suggestions across PostgreSQL, MySQL, SQLite, SQL Server, and BigQuery.
The definitive guide to SQL query optimization. Master EXPLAIN execution plans, SARGable predicates, covering indexes, and keyset cursor pagination.
Quick answer
SQL query optimization is the systematic process of minimizing disk I/O, CPU consumption, and memory usage for database queries. Practitioner tuning focuses on five core interventions: 1) making WHERE predicates SARGable to unlock B-Tree index seeks, 2) eliminating SELECT * in favor of covering index scans, 3) indexing foreign key join paths, 4) switching from OFFSET pagination to keyset cursor pagination, and 5) refreshing table statistics.