help about FGA

Hi,all

   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!    

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