DATABASE EXCLUSIVE CONTROL METHOD, DEVICE THEREFOR AND STORAGE MEDIUM STORED DATABASE EXCLUSIVE CONTROL PROGRAM

摘要

PROBLEM TO BE SOLVED: To delete excessive exclusive control at the time of reference processing by performing exclusive control over database data when the reference processing is started during update processing operation and not performing the exclusive control over the database data when the reference processing is started while the update processing operation is not in process. SOLUTION: When the reference transaction 102 is started while all updating operations are off, an exclusive control part 107 does not perform the exclusive control and starts the processing of an update transaction 103 arter the reference transaction 102 ends, thereby performing exclusive control over database data 108. Further, when an update counter 105 indicates 0, it indicates that there is no transaction being updated and when a reference counter 106 indicates 0, its indicates that there is no transaction being referred to. The exclusive control part 107, therefore, performs the exclusive processing by referring to a start state flag 104, the update counter 105, and the reference counter 106.