摘取 page78,这真是本好书

SET serveroutput ON
DECLARE
l_string VARCHAR2(255);
l_dummy NUMBER;
BEGIN
l_dummy := DBMS_UTILITY.GET_PARAMETER_VALUE('background_dump_dest',l_dummy,l_string);
DBMS_OUTPUT.PUT_LINE('backgroud: '||l_string);
l_dummy := DBMS_UTILITY.GET_PARAMETER_VALUE('user_dump_dest',l_dummy,l_string);
DBMS_OUTPUT.PUT_LINE('user: '||l_string);
END;