Data is at the center of many challenges in system design today. Difficult issues such as scalability, consistency, reliability, efficiency and sustainability need to be resolved. Additionally, we have a wide variety of tools, including relational databases, NoSQL data stores, stream or batch processors, and message brokers. What are the right options for your application? How do you make sense of all these fashionable words?In this practical and comprehensive guide, author Martin Kleppmann helps you navigate this diverse landscape by examining the pros and cons of various technologies for processing and storing data. Software continues to evolve, but the basic principles remain the same. With this book, software engineers and architects will learn how to apply these ideas in practice and how to take full advantage of data in modern applications.