Refreshing distributed multiple views and replicas

In this paper the authors describe a replication server scheme with an algorithm DRF (Differential Refresh File) to refresh multiple materialized views and replicas in distributed environments. Before sending relevant tuples in server sites to client sites, an effective tuple reduction scheme is developed as a preprocessor to reduce the transmission cost. Because it utilizes differential files without touching base relations, the DFR scheme can help to minimize the number of locks, which enhances the system’s performance.