Re-wire Oracle SOA Datasource to use Active GridLink for RAC

Starting 11gR1 PS5 (11.1.1.6), Oracle SOA Suite platform is enhanced to support Active GridLink for Real Application Clusters (RAC).

WebLogic Server Active GridLink (AGL) for RAC provides the best available support for the RAC features in Oracle Database 11g. The generic data source is the implementation for single database access. The Multi-data source is the native WebLogic middle tier implementation for RAC integration, which does not leverage Oracle Notification Service (ONS).

The GridLink data source is the new Active GridLink implementation and includes the features of generic data sources, taking advantage of Oracle RAC supporting Fast Connection Failover (FCF), Runtime Connection Load-Balancing (RCLB), and XA Affinities. A GridLink data source is created for JDBC connectivity between WebLogic Server and a service targeted to an Oracle RAC cluster. It uses the Oracle Notification Service (ONS) to adaptively respond to state changes in an Oracle RAC instance.

Here are couple of good resources that can help you understand the AGL concepts in more detail:
- What is Active GridLink
- Benefits of AGL data sources

Basically, a data source configuration is always an Active GridLink (AGL) data source configuration if FanEnabled=true or the OnsNodeList is non-null.

Here is a modified version of a python script (borrowed from my colleague), that you can use to rewire the SOA data sources to use Active GridLink for RAC databases. Before executing the script, remember to shutdown all the WLS SOA domain servers; its an offline wlst script.