www.goodreads.comSimon Chiu's review of High Performance PostgreSQL for Rails5/5: This is a very good reference book. I follow Andrew on X/Twitter and he knows his stuff around PostgreSQL and Rails. I bought this book initially for the chapters surrounding performance, of which there are plenty. Andrew is very to-the-point in his writing style. Favourite sections of mine include the index optimization and working with bulk data. Overall, I would recommend this book as a primer on PG performance in the context of Rails deployments as required reading material for most engineering teams.