According to Gartner, the operational database management system (DBMS) market is defined by relational and non-relational database management products that are suitable for a broad range of enterprise-level transactional applications, including purchased business applications such as enterprise resource planning, customer relationship management and customized transactional systems. The operational DBMS market is evolving dramatically, with new entrants and incumbents supporting the growing use of unstructured data and NoSQL DBMS engines. if you want to see the full report : http://www.gartner.com/technology/reprints.do?id=1-23A415Q&ct=141020&st=sb,