38-1:
	conn system/admin
	exec dbms_fga.add_policy('scott','emp','emp_policy','deptno=20',statement_types => 'select,update,delete')
38-2:
	conn scott/tiger
	UPDATE emp SET sal=sal+100 WHERE deptno=20;
	SELECT ename,sal FROM emp WHERE deptno=20;
	conn system/admin
	SELECT db_user,sql_text FROM dba_fga_audit_trail WHERE object_name='EMP';


