This text points out how to ensure professional and efficient database software development in DB2 mainframe and client/server environments. This book covers both technical aspects (performance, tuning) and organizational measures (economical performance) and consequently, is suitable particularly for organizations that want to use DB2 in an economical and safe way. Work in various large production systems with DB2 revealed that most performance problems arise either from a certain critical transaction load onwards for particularly large tables. Many measures can be taken in order to identify and to solve these problems during software development and not, as is often the case, only in production environment. Beyond explaining the causes for such performance problems, this book also describes and explains well-proven measures to avoid such problems. It addresses those persons who are responsible for data processing and quality assurance; project leaders and project managers in the data processing area; and software and application developers.