The complete guide to learning everything you need to know about Apache Ignite. This book is addressed to anyone interested in learning in-memory computing and distributed database. It is useful for developers and architects new to Apache Ignite as well as those who already use any other in-memory databases and want to expand their knowledge. The Apache Ignite is a memory-centric distributed database, caching and computing platform for developing the data-intensive application to scale out to hundreds of millions of transactions per seconds and petabyte of in-memory data. This next generation memory-centric platform can function as an in-memory data grid, or it can be deployed as a full functional persistence data store with SQL and ACID transaction support. The main mantra of the Apache Ignite platform is to keep the entire dataset into in-memory and on disk, boost application performance by providing caching capabilities and processing data in parallel. Such a paradigm has been identified as the answers to problems of traditional disk-based database performance since it can load and execute all the necessary datasets in memory. This paradigm eliminates the substantial number of disk IO, which hamper transactions and create a performance bottleneck for the traditional database systems.