我們看一下本地資料庫tnsnames的配置：
testrac =
(description =
(address = (protocol = tcp)(host = 10.58.12.124)(port = 1521))
(address = (protocol = tcp)(host = 10.58.12.125)(port = 1521))
(load_balance = yes)
(connect_data =
(server = dedicated)
(service_name = 10.58.12.124)
(failover_mode =
(type = select)
(method = basic)
(retries = 180)
(delay = 5)))
oracle在文件note:364855.1：rac connection redirected to wrong host/ip ora-12545中進行了描述，並給出了解決方法：修改資料庫中的初始化引數local_listener（注：這種方法在修改初始化引數後，需要重啟監聽，重啟例項）
sql>conn / as sysdba;
connected.
sql> alter system set local_listener = '(address = (protocol = tcp)(host = 10.58.12.124)(port = 1521)) 'sid = 'prodb1';
系統已更改。
登入另外乙個節點
sql>conn / as sysdba;
connected.
sql> alter system set local_listener = '(address = (protocol = tcp)(host = 10.58.12.125)(port = 1521))' sid = 'prodb2';
系統已更改。
設定之後，再次嘗試連線資料庫：
sql> conn sys/ted@123e@prodb as sysdba;
connected.
sql> conn sys/ted@789e@prodb as sysdba;
connected.
修改之後，沒有再次出現同樣的錯誤。
我們也可以通過只修改客戶端hosts檔案的方式，來解決這個問題。
首先在linux主機上修改hosts檔案
root@prodb1 # vi /etc/hosts
#10.58.12.120 prodb1-public # public
10.58.12.124 prodb1 # virtual
23.23.23.120 prodb1-priv # private
10.58.12.121 prodb2-public # public
10.58.12.125 prodb2 # virtual
23.23.23.121 prodb2-priv # private
10.58.12.126 prodb-scan # scan
然後客戶端的tnsnames.ora中的配置如下：
$ more $oracle_home/network/admin/tnsnames.ora
# tnsnames.ora network configuration file: /data/oracle/product/11.2/database/network/admin/tnsnames.ora
# generated by oracle configuration tools.
listeners_prodb =
(address_list =
(address = (protocol = tcp)(host = 10.58.12.124)(port = 1521))
(address = (protocol = tcp)(host = 10.58.12.125)(port = 1521))
)listener_prodb1 =
(address = (protocol = tcp)(host = 10.58.12.124)(port = 1521))
listener_prodb2 =
(address = (protocol = tcp)(host = 10.58.12.125)(port = 1521))
prodb =
(description =
(address = (protocol = tcp)(host = 10.58.12.124)(port = 1521))
(address = (protocol = tcp)(host = 10.58.12.125)(port = 1521))
(load_balance = yes)
(connect_data =
(server = dedicated)
(service_name = prodb)
(failover_mode =
(type = select)
(method = basic)
(retries = 180)
(delay = 5)))
)prodb1 =
(description =
(address = (protocol = tcp)(host = 10.58.12.124)(port = 1521))
(connect_data =
(server = dedicated)
(service_name = prodb)
(instance_name = prodb1)))
prodb2 =
(description =
(address = (protocol = tcp)(host = 10.58.12.125)(port = 1521))
(connect_data =
(server = dedicated)
(service_name = prodb)
(instance_name = prodb2)))
下面嘗試連線遠端rac資料庫：
sql> conn sys/ted@123e@prodb as sysdba;已連線。
sql> conn sys/ted@789e@prodb as sysdba;已連線。
其實在本地hosts檔案中加上rac例項所在伺服器的ip和主機名資訊，就可以避免這個錯誤。
另外注意在rac環境中，任何修改都一定要謹慎。rac 環境一旦安裝好後，主機名就不能隨意修改，除非先刪除節點，修改hostname，再新增節點。還有一點主機名必須和public名一致，這一點也非常重要。
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