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861100 wrote:ORA-12154 ALWAYS only occurs on SQL Client & no SQL*Net packets ever leave client system
but the error appear ora-12154 ????
ORA-12154 NEVER involves the listener, the database itself or anything on the DB Server.
ORA-12154 occurs when client requests a connection to some DB server system using some connection string.
TNS-03505 is thrown by tnsping & is same error as ORA-12154 thrown by sqlplus or others.
The lookup operation fails because the name provided can NOT be resolved to any remote DB.
The analogous operation would be when you wanted to call somebody, but could not find their name in any phonebook.
The most frequent cause for the ORA-12154 error is when the connection alias can not be found in tnsnames.ora.
The lookup operation of the alias can be impacted by the contents of the sqlnet.ora file; specifically DOMAIN entry.
TROUBLESHOOTING GUIDE: ORA-12154 & TNS-12154 TNS:could not resolve service name [ID 114085.1]
thanks i found all answer of my question , but i have one question please
i know i can reallocate the scan ip manual can you please tell me how , another rac with two node
one master and other is slave can i switch between these means
node 1 is master node 2 is salve can i do node 2 as master but without restart the server???thanks in advance.