Web Reference: I am evaluating Oracle SQL Developer. My tnsnames.ora is populated, and a tnsping to a connection defined in tnsnames.ora works fine. Still, SQL Developer does not display any connections. Oracle... -2 In my case, (ORA-12560: TNS protocol adapter error)Issue cause of database connection issue like database, user name and password. Once you got the issue. Initially you have to check connection details, after check the oracle service and further more. ORA-12154: TNS:could not resolve the connect identifier specified 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.
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