UNSHARED TYPE DATABASE SYSTEM, SYNCHRONIZING DEVICE, DATABASE SERVER, ITS SYNCHRONIZING METHOD, AND SYNCHRONIZING PROGRAM

摘要

PROBLEM TO BE SOLVED: To suppress a decrease in performance resulting from synchronization processing in an unshared type database system.SOLUTION: There is provided an unshared type database system including a synchronizing device connected to a client through a network and a plurality of database servers connected to the synchronizing device and occupying predetermined storage areas respectively. The synchronizing device transmits a synchronization instruction and a synchronization completion signal to a first database server to control synchronization between the first database server and a second database server. When receiving the synchronization instruction, the first database server copies a storage area to be occupied to the second database server after starting generating a log of transactions to be processed, and transmits the log to the second database server. The first database server finishes generating the log on receiving the synchronization completion instruction from the synchronizing device. The second database server receives the log and executes update of storage areas.