DATA USAGE SYSTEM, HISTORY MANAGEMENT SYSTEM FOR TIMED DATA AND DATA PROCESSING SYSTEM

摘要

The present invention is a data usage system (10) which is provided with AP servers (14) and a plurality of database servers (16), wherein each database server (16) is provided with shared tables which hold the same data. On each table is imposed a constraint limiting key categories to one and a constraint prohibiting update and deletion. A search condition division processing unit (20) of the AP server (14) divides search conditions in order to assign the same to a plurality of search processing units (22). Each search processing unit (22) issues corresponding SQL for a corresponding database server (16) and assigns computation processing to a data processing unit (24) whenever a fixed quantity of search results are transmitted, and, at the point in time in which the processing results are collected, aggregation results are output to a search result integration processing unit (26). The search result integration processing unit (26) gathers the aggregation results from each search processing unit (22) so as to output the same as search results. An additional data receiving unit (27) assigns a copy of additional data which have been input to each registration processing unit (28), and each registration processing unit (28) issues SQL for acquiring registration of the additional data to a corresponding database server (16).