Oracle WebLogic Server 11g Administration Handbook

Understanding WebLogic JDBC Configuration

An interesting thing to note about JDBC resources is that both system administrators and developers can create a JDBC resource, but the deployment and management (how to modify it) depends on who creates the resource. A system administrator can create a JDBC module, called a system module, using the Administration Console or WLST. A developer can also create a JDBC module, called an application module, with a tool that allows the creation of the necessary XML descriptor file and add the JDBC module to the packaged application, which is then deployed by the administrator.

The choice of how a resource is scoped is mostly a decision about whether the resource and its connection pool are to be shared across ...