ORACLE CALL BACK TRACE
CREATE OR REPLACE PROCEDURE proc3
IS
BEGIN
DBMS_OUTPUT.put_line ('calling proc2');
proc2;
EXCEPTION
WHEN OTHERS
THEN
DBMS_OUTPUT.put_line ('Error backtrace at top level:');
DBMS_OUTPUT.put_line (DBMS_UTILITY.format_error_backtrace);
END;