If your application uses a "gateway/proxy" user to talk to the database the DBA is limited in his/her ability to track back a high-impact SQL to the user or module executing it.

Recommendation:
Populate additional information into DBA views to allow better traceability of queries in the database back to the user/module that is executing them. DBMS_APPLICATION_INFO provides a way of populating the V$SESSION and V$SQLAREA views with context information about application users. Oracle's eBusiness Suite uses this to allow DBAs to identify what module a user is in, what the current transaction is and what the context is. By using DBMS_APPLICATION_INFO the DBA will have better visibility to queries that are happening in the database and how these relate to application functionality.