Oracle® Database 11g / 12c / 18c error codes ORA-12154: TNS:could not resolve the connect identifier specified
ORA-12154: TNS:could not resolve the connect identifier specified
Oracle Error Code: ORA-12154
Cause: A connection to a database or other service was requested using a connect identifier, and the connect identifier specified could not be resolved into a connect descriptor using one of the naming methods configured. For example, if the type of connect identifier used was a net service name then the net service name could not be found in a naming method repository, or the repository could not be located or reached.