DATABASE MANAGEMENT SYSTEM

PROBLEM TO BE SOLVED: To shorten processing time against an inquiry. SOLUTION: A database management system is provided with an inquiry reception means 10, an inquiry registration means 12, a plural inquiries optimizing means 14, a registration inquiry starting means 16, an inquiry optimizing means 18, an inquiry execution means 20 and a data accumulation means 22. The inquiry reception means receives a started inquiry. The inquiry registration means 12 registers the received inquiry. The plural inquiries optimizing means 14 optimizes the execution of plural registered inquires and registers an optimum execution procedure. The registration inquiry starting means 16 starts plural registered inquires in accordance with the registered execution procedure at designated time. The inquiry optimizing means 18 optimizes the processing system of the started inquiry. The inquiry execution means 20 retrieves and updates data stored in the data accumulation means in accordance with the optimized processing system and processes the started inquiry.