TNS-12154: TNS:could not resolve the connect identifier specified

Hi,

Sometimes You can get “TNS-12154: TNS:could not resolve the connect identifier specified ” error.

Details of error are as follows.

TNS-12154: TNS:could not resolve the connect identifier specified

– 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 identifier

– 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.

Do you want to learn more details about RMAN, then read the following articles.

https://ittutorial.org/rman-backup-restore-and-recovery-tutorials-for-beginners-in-the-oracle-database/