现象:

在windows客户端sqlplus工具使用VIP或scan的IP无法连接,报错如下:

C:\Users\WJW>sqlplus system/qweasd@192.168.2.200:1521/orcl

SQL*Plus: Release 11.2.0.1.0 Production on Thu May 17 12:35:28 2012

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

ERROR:
ORA-12545: Connect failed because target host or object does not exist


检查各组件状态,正常,TNSPING也是通的


原因:
metalink说明:Client is able to resolve all Fully Qualified Domain Name (FQDN) SCAN and VIP name but not short ones(without domain name) as its in different domain; 

even though FQDN names were specified during Grid Infrastructure setup, due to bug 9150053 by default DBCA set database parameter local_listener to short node VIP name 

while database is created.
因此只要把数据库实例参数local_listener内的host改为vip的IP地址即可

解决办法:
rac1:
SQL> show parameter local_listener

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
local_listener                 string     (DESCRIPTION=(ADDRESS_LIST=(AD
                         DRESS=(PROTOCOL=TCP)(HOST=rac1
                         -vip)(PORT=1521))))
SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.2.111)(PORT=1521))))' scope=both sid='orcl1';
SQL> alter system register;

rac2:
SQL> show parameter local_listener

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
local_listener                 string     (DESCRIPTION=(ADDRESS_LIST=(AD
                         DRESS=(PROTOCOL=TCP)(HOST=rac2
                         -vip)(PORT=1521))))
SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.2.112)(PORT=1521))))' scope=both sid='orcl2';
SQL> alter system register;

随后使用windows客户端连接成功:
C:\Users\WJW>sqlplus system/qweasd@192.168.2.200:1521/orcl

SQL*Plus: Release 11.2.0.1.0 Production on Thu May 17 13:14:39 2012

Copyright (c) 1982, 2010, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options


另外解决Oracle 11gR2 RAC 无法在客户端通过scanIP连接数据库
安装完Oracle 11g rac后,在10g的客户端的 tnsnames.ora中配置好,scanip,但是无法访问,报错为目标主机不存在,折腾了很久,没弄明白,后面查到,系统初始化参数里有local_listener这一项,在这里可以对host的值加以修改,将scanip注册进来、在监听器中使用vip!

--------------------------------------------------------------------------
在racnode1服务器上:

[root@racdb1 ~]# su - oracle
[oracle@racdb1 ~]$ sqlplus /nolog
 
SQL*Plus: Release 11.2.0.1.0 Production on Wed Apr 21 13:44:12 2010
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
SQL> conn /as sysdba
Connected.
SQL> show parameter local_listener;
NAME                                 TYPE        VALUE
--------------------------------------------------------------------------


local_listener                       string      (DESCRIPTION=(ADDRESS_LIST=(AD
                                                 DRESS=(PROTOCOL=TCP)(HOST=rac1_vip)(PORT=1521))))


设置
SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=racscan)(PORT=1521))))' scope=both sid='racdb1';
System altered.
SQL>
-------------------------------------------------------------------------
节点二上面也是,一样的修改。