oracle10g RAC ora-12545因目標主機或對象不存在的錯誤解決

由于歷史原因，應用升級需要成本，最近新上了一套oracle 10g RAC （10.2.0.5），測試時，從其他應用服務器，鏈接這套數據庫，使用的是vip鏈接，發現大量報錯，報錯為ora-12545因目標主機或對象不存在。
ORA-12545: Connect failed because target host or object does not exist


查詢網上資料和mos文檔，

導致這個問題的原因
Whe LOCAL_LISTENER is not set at all or is not set correctly, PMON can register both the VIP hostname and the physical hostname with the REMOTE_LISTENER.  This is incorrect in RAC but if it does occur, the client can intermittently be routed to a listener endpoint on either of these addresses.  If the client is unable to resolve the physical hostname or even the vip hostname, the connection will fail with ORA-12545.

由于LOCAL_LISTENER未配置或者配置不爭取，PMON進程使用的是REMOTE_LISTENER注冊vip hostname和物理地址，在rac里面，這是不對的配置，客戶端無法使用這些地址正確路由到監聽服務器。如果客戶端無法正確解析物理地址或者vip的hostname，鏈接就會報 ORA-12545錯誤。


Additionall, if the VIP hostname cannot be resolved, but the VIP numerical address is reachable; then this VIP numerical address should be used as the HOST value for LOCAL_LISTENER instead.


And important first set is to check the output for :  lsnrctl services


You should not see the physical hostname in the handler information for your RAC instances.   Here's an example of an incorrect lsnrctl services output for a 2-node RAC cluster:


lsnrctl services oracle_rac_listener 
Service "oracle.oracle.com" has 2 instance(s). 
Instance "orcl1", status READY, has 2 handler(s) for this service... 
Handler(s): 
"DEDICATED" established:0 refused:0 state:ready 
REMOTE SERVER 
(ADDRESS=(PROTOCOL=TCP)(HOST=myphysicalhost1)(PORT=1521)) 
"DEDICATED" established:326 refused:0 state:ready 
LOCAL SERVER 


Instance "orcl2", status READY, has 1 handler(s) for this service... 
Handler(s): 
"DEDICATED" established:394371 refused:0 state:ready 
REMOTE SERVER 
(ADDRESS=(PROTOCOL=TCP)(HOST=myphysicalhost2)(PORT=1521))
 


Here's an example of what it ought to look like when LOCAL_LISTENER is configured correctly:


lsnrctl services oracle_rac_listener 
Service "oracle.oracle.com" has 2 instance(s). 
Instance "orcl1", status READY, has 2 handler(s) for this service... 
Handler(s): 
"DEDICATED" established:0 refused:0 state:ready 
REMOTE SERVER 
(ADDRESS=(PROTOCOL=TCP)(HOST=myVIP_host1)(PORT=1521)) 
"DEDICATED" established:326 refused:0 state:ready 
LOCAL SERVER 


Instance "orcl2", status READY, has 1 handler(s) for this service... 
Handler(s): 
"DEDICATED" established:394371 refused:0 state:ready 
REMOTE SERVER 
(ADDRESS=(PROTOCOL=TCP)(HOST=myVIP_host2)(PORT=1521))


解決方案：

分別修改兩邊的RAC實例的LOCAL_LISTENER配置。
alter system set LOCAL_LISTENER="(address=(protocol=tcp)(port=1521)(host=))" scope=both sid='INSTANCE_NAME1';
alter system set LOCAL_LISTENER="(address=(protocol=tcp)(port=1521)(host=))" scope=both sid='INSTANCE_NAME2'; 


另外，相關配置REMOTE_LISTENER.
alter system set REMOTE_LISTENER='' scope=both sid='*';

另外parallel_instance_group參數也可以配置不一樣的值

alter system set parallel_instance_group="A" scope=both sid='INSTANCE_NAME1';
alter system set parallel_instance_group="B" scope=both sid='INSTANCE_NAME2'; 

最后，注意的是，修改完后，重啟監聽，如果重啟監聽都不行，重啟一下數據庫或者兩個實例重啟一下。