可更新物化视图站点结构图
This image shows that client applications can query and update an updatable materialized view at the materialized view site. These applications can also update data at the master. When the materialized view refreshes, the materialized view is updated with the changes at the master and the master is updated with the changes at the materialized view.
http://docs.oracle.com/cd/B19306_01/server.102/b14226/repmview.htm#sthref396