Can anyone tell about the  parameters of parameter"handler_module" in dbms_fga.add_policy? And when the handler_module is invoked?I means if i want to make aduit on SELECT statement,and now a user executes a select statment that statifies the audit condition,then is the handle_module revoked before the select result return to the user or after the select statement result returns to the user?  

   Thank you in advance!