Description of the illustration ha_rac_newnode1.gif
The figure shows how data sources and multi data sources connect two WebLogic server groups with three Oracle RAC instances.
Each group connects to one multi data source. Each multi data source connects to two existing data sources and one new data source.
One data source under multi data source A connects to Oracle RAC 1 as a primary database and the other two data sources connect to Oracle RAC 2 and RAC 3 as backup databases. One data source under multi data source B connects to Oracle RAC 2 as a primary database and the other two data sources connect to Oracle RAC 1 and Oracle RAC 3 as backup databases. The new data sources are those connecting multi data source A and B to Oracle RAC 3.