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Learn to identify and resolve 10 critical database performance mistakes that plague Rails and PostgreSQL applications in this 31-minute conference talk from RailsConf 2025. Discover how poor data types, inefficient queries, and flawed schema designs lead to excessive costs through over-provisioned servers, downtime, lost users, and wasted engineering hours. Explore real-world examples of database pitfalls drawn from extensive consulting and backend engineering experience, understanding both their root causes and business impact. Master practical solutions for query design optimization, strategic indexing, schema improvements, and how CPU, memory, and IOPS resources directly affect Active Record SQL performance. Gain actionable insights you can immediately implement to prevent costly database mistakes and focus your optimization efforts for maximum impact. Access accompanying slides and blog posts through the provided GitHub resources for continued learning and reference.
