2017 by Jesper Wisborg Krogh and Mikiya Okuno Whom This Book Is For The book has been written for database administrators who are looking into deploying MySQL NDB Cluster or already have a cluster in production and want to increase their knowledge to be able to handle routine administrative tasks and troubleshooting. While we have attempted to write the book assuming as little existing knowledge as possible, it is an advantage to have at least some SQL database background.