$ 0 0 Lian, Since this is an Instant Client confirm that it has been configured properly. See the video here. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0ahUKEwi-tfrQy6DOAhUKymMKHVewBn8QFgg1MAM&url=https%3A%2F%2Fsupport.software.dell.com%2Ftoad-for-oracle%2Fkb%2F76454&usg=AFQjCNHikrXRYweiyDad7WcUZsicHt0LIw&sig2=vbZtfAP_89IYqZ91jVGujg