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Learn to identify and resolve 10 critical database performance mistakes that plague Rails applications through this 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 experience with Rails and PostgreSQL applications, understanding both their causes and business impact. Master practical solutions for query design optimization, strategic indexing, and schema improvements while learning how CPU, memory, and IOPS resources directly affect Active Record SQL performance. Gain actionable strategies for prioritizing database optimizations to achieve maximum performance improvements in existing applications serving inefficient queries. Access comprehensive takeaways including slides and supplementary blog posts available on GitHub for continued reference and implementation.
