DATA BASE CONTROL SYSTEM

PURPOSE:To update a data base even in the middle of back-up recording an updata transaction number in a record. CONSTITUTION:When a transaction (Tr) gives the request of the update of the data base, a data base updating control part 5 writes the record into the back up value page of the record when the update Tr number of the record is not included in a back up start time completion Tr list (CTRL) 4. When it is included in CTRL and the updating Tr number is not equal to the number of an updating request, the data base updating control part 5 writes the record into the pre-updating value page of the record. Then, the data base updating control part 5 writes the updating value of the record and the number of Tr which gives the updating request into a present value page, and writes a data base table identifier and the value of a record mainbody into a log. Thus, updating during back-up work is terminated.