Jürgen Glag's book highlights how to ensure professional and efficient database software development in DB2 mainframe and client/server environments. The strength of this book lies in its coverage of both technical aspects (performance, tuning) and organizational measures (economic performance). As a result, this book is particularly suitable for organizations that want to use DB2 in an economical and safe manner. Experience in various large production systems with DB2 has shown that most performance problems arise either from a certain critical transaction load or from particularly large tables. Many measures can be implemented to identify and solve these problems during software development, rather than only in the production environment, as is often the case. In addition to explaining the causes of performance issues, this book also describes and explains well-proven measures to avoid such problems.