11. The computer program product of claim 8 , wherein the method further comprises: updating the status information of each copy of each database table in the distributed database system.
12. The computer program product of claim 11 , wherein the method further comprises: requesting status information of each copy, of said each database table in the distributed database system, from the database device which stores said each copy; receiving a latest status information of a copy of the database table that is sent by the database device in response to the received request; and updating current status information of a copy of the database table with received latest status information of the copy of the database table.