A comprehensive guide to debugging and optimizing query performance in Rails applications using built in tools, gems, and database specific utilities for PostgreSQL, MySQL, and SQLite.

Saeloun Blog offers insights, tutorials, and updates on Ruby on Rails development, React.js, and software engineering. Covering topics such as frontend frameworks, API integrations, and agile methodologies, Saeloun Blog provides resources for developers and product teams. Developers can learn about building modern web applications, integrating React components with Rails, and adopting best practices in software development through Saeloun's blog posts and case studies.

Saeloun

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.

Different Approaches to Debugging Query Performance in Rails