Different Approaches to Debugging Query Performance in Rails

A systematic guide to debugging slow database queries in Rails applications. Covers built-in Rails tools including the `explain` method (with Rails 7.1 enhancements), `load_async`, ActiveSupport::Notifications, query log tags, and strict loading mode. Also covers essential gems like Bullet, rack-mini-profiler, and prosopite. Includes database-specific tools for PostgreSQL (pg_stat_statements, PgHero, pgBadger), MySQL (Performance Schema, pt-query-digest), and SQLite (EXPLAIN QUERY PLAN). Addresses Rails 8 specifics including SQLite as a production database and Solid Cache's impact on query logs. Concludes with a five-step practical debugging workflow and production monitoring options.