Oracle Solution for Error ora-12504

ORA-12504: TNS:listener was not given the SERVICE_NAME in CONNECT_DATA

What triggered the Error:

The listener was not configured with a default service and SERVICE_NAME was missing from the CONNECT_DATA received by the listener.

What should we do to fix it:

Possible solutions are: *- Configure DEFAULT_SERVICE parameter in LISTENER.ORA with a valid service name. Reload the listener parameter file using reload []. This should be done by the LISTENER administrator. *- If using a service name, Check that the connect descriptor corresponding to the service name in TNSNAMES.ORA has a SERVICE_NAME or SID component in the CONNECT_DATA.