Oracle Solution for Error ora-12154
ORA-12154: TNS:could not resolve the connect identifier specified
What triggered the Error:
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.
What should we do to fix it:
*- If you are using local naming (TNSNAMES.ORA file).
*- Make sure that "TNSNAMES" is listed as one of the values of the NAMES.DIRECTORY_PATH parameter in the Oracle Net profile (SQLNET.ORA.
*- Verify that a TNSNAMES.ORA file exists and is in the proper directory and is accessible.
*- Check that the net service name used as the connect identifier exists in the TNSNAMES.ORA file.
*- Make sure there are no syntax errors anywhere in the TNSNAMES.ORA file. Look for unmatched parentheses or stray characters. Errors in a TNSNAMES.ORA file may make it unusable.
*- If you are using directory naming.
*- Verify that "LDAP" is listed as one of the values of the NAMES.DIRETORY_PATH parameter in the Oracle Net profile (SQLNET.ORA).
*- Verify that the LDAP directory server is up and that it is accessible.
*- Verify that the net service name or database name used as the connect identifier is configured in the directory.
*- Verify that the default context being used is correct by specifying a fully qualified net service name or a full LDAP DN as the connect identifie.
*- If you are using easy connect naming.
*- Verify that "EZCONNECT" is listed as one of the values of the NAMES.DIRETORY_PATH parameter in the Oracle Net profile (SQLNET.ORA).
*- Make sure the host, port and service name specified are correct.
*- Try enclosing the connect identifier in quote marks. See the Oracle Net Services Administrators Guide or the Oracle operating system specific guide for more information on naming.
