DISTRIBUTED DATA BASE SYSTEM

摘要

PURPOSE:To find the predictive execution time required for an inquiry process as necessary when a user makes an inquiry. CONSTITUTION:Data bases provided on respective sites are mutually utilized, it is decided whether or not the execution time is predicted as to an inquiry from a user at each site, and a group of inquiry commands is divided into the process units of the respective commands. Information relating to the data base at this side and information relating to the data bases at other sites are stored and information in a data base to be used in response to an inquiry is found by using the stored information and information including processing time relating to the respective commands used for inquiries is stored and a command processing means 14 finds the processing time corresponding to the respective commands divided into the processing units by referring the information to calculate the predictive execution time required for the inquiries according to those reference results.