Explore database optimization techniques for legacy applications in this 37-minute conference talk from PHP UK Conference. Learn how to overcome bottlenecks and improve performance without major structural changes. Discover the benefits of NoSQL databases for data consolidation and the power of MapReduce for enhancing project efficiency. Delve into topics such as database scaling, binary trees, dimensional tables, and text search. Gain insights on handling money transactions and addressing passive aversion in legacy systems. Master the art of database wizardry to transform spaghetti code into a well-structured, high-performance application.