If you are asking these types of questions then take some time out to find out more about DMS.
What is DMS? Yes, another acronym .. sorry ... translation : "Dynamic Monitoring Service." It is a service which enables Oracle Fusion Middleware components to provide data regarding the component's performance, state and ongoing behavior. DMS measures and reports metrics, trace events and system performance and provides a context correlation service for these components.
Oracle Fusion Middleware Performance and Tuning Guide 11g Chapter 6 Oracle Dynamic Monitoring Service Performance Tuning is the place to find out more. Read the full article here.
For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.