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.
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. 13. The computer program product of claim 11 , wherein the method further comprises: receiving the latest status information of each copy of the each database table pushed by the database device which stores the copy of the database table; and updating the current status information of each copy of the database table with the received latest status information of the copy of the database table.