Cause
No value was specified for the SERVICE_NAMES system parameter, nor for the DB_NAME parameter.
No value was specified for the SERVICE_NAMES system parameter, nor for the DB_NAME parameter.
Add an SERVICE_NAMES or DB_NAME definition to the INIT.ORA file. By default, SERVICE_NAMES is the value of DB_NAME unless SERVICE_NAMES is explicitly specified.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/1228927
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