1. The data safety of transaction processing is significant for bank card payment environment.

2. Users themselves can be the Achilles' heel of security systems because of their propensities for error and their tendency (however unwittingly) to trade data safety for ease of use.

3. Because of the disperse location and data safety, each system create a database in his own LAN for own use, therefore it come into being a typical heteromorphosis distributed database model.