DATABASE SYSTEMS PERFORMANCE EVALUATION FOR IOT APPLICATIONS Christodoulos Asiminidis1 , George Kokkonis2 and Sotirios Kontogiannis1 1Laboratory team of Distributed Microcomputer systems, Department of Mathematics, University of Ioannina, Ioannina, Greece 2Department of Business Administration, TEI of Western Macedonia, Grevena, Greece ABSTRACT The amount of data stored in IoT databases increases as the IoT applications extend throughout smart city appliances, industry and agriculture. Contemporary database systems must process huge amounts of sensory and actuator data in real-time or interactively. Facing this first wave of IoT revolution, database vendors struggle day-by-day in order to gain more market share, develop new capabilities and attempt to overcome the disadvantages of previous releases, while providing features for the IoT. There are two popular database types: The Relational Database Management Systems and NoSQL databases, with NoSQL gaining groun...