Analog two replication algorithm, introduced the grading system of thought. The algorithm takes into account the typical mobile computing environments trusted part of the performance differences and moving parts, the entire mobile computing environment is divided into two stages, the first stage is the base nodes remain connected via the fixed network, each base node maintain a copy of the , and the group node is the node most of the data object, this base-level replication is replicated between nodes. The second level is often in a state of disconnection mobile nodes, they are sometimes connected through a wireless network to the base node, sometimes in a disconnected state, there are also part of the copy of the , this level refers to the mobile node replication and Copy groups between nodes. Thus, to maintain a credible part of the total number of feature traditional distributed computing environment, and not because of the introduction of mobile computing adverse effect on system p

base_node
.........\base_node.h
.........\DB.cpp
.........\main.cpp
.........\ret_sql.txt
.........\socket_ser.cpp
mobile_node
...........\DB.cpp
...........\main.cpp
...........\mobile_node.h
...........\odd.txt
...........\ret_recv.txt
...........\ret_sql.txt
...........\socket_cli.cpp
...........\sql.txt
README.txt

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