It is no exaggeration to say that the success or failure of digital transformation (DX) will be determined by the ability to pick up market demand in detail through the use of IoT and respond with services in real time. In smart cities, it is also necessary to develop services in real time based on the movements of visitors and the status of facilities. However, there are many projects that fail to create such a real-time system and get stuck in the data accumulation and analysis phase. The reason for this is that it is difficult to compound the data flow that keeps occurring asynchronously from a large number of sensors without using a database to achieve real-time performance. In this presentation, I will introduce how to apply EDA to DX.