摘要
In this paper,two cases of data consistency problems are discussed in Multi_user Geographical Information System.When a user updates some spatial data that have been accessed by other users in database,or executes an UNDO/REDO operation,data consistency will probably be destroyed.To solve the problem caused by the first case,a “Notification_Reread Method" is introduced.As for the second case,there are many problems to be studied.
In this paper,two cases of data consistency problems are discussed in Multi_user Geographical Information System.When a user updates some spatial data that have been accessed by other users in database,or executes an UNDO/REDO operation,data consistency will probably be destroyed.To solve the problem caused by the first case,a “Notification_Reread Method' is introduced.As for the second case,there are many problems to be studied.
