[oracle@c4yybcv3] /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin> tnsping toyy3_scan
TNS Ping Utility for IBM/AIX RISC System/6000: Version 11.2.0.3.0 - Production on 26-MAY-2015 09:36:51
Copyright (c) 1997, 2011, Oracle. All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL =TCP)(HOST =10.19.243.28)(PORT = 1521)))
TNS-12533: TNS:illegal ADDRESS parameters ======>总是报TNS12533

解决方法：
把格式调整的一行解决（其中也不知道哪里多了一个空格）
toyy3_scan =(DESCRIPTION =(ADDRESS_LIST =(ADDRESS =(PROTOCOL= TCP)(HOST= 10.19.243.28)(PORT=1521)))(CONNECT_DATA =(SERVICE_NAME = orayy3)))