12154 Error Oracle
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TNS:received bad packet type from network layer Cause: Internal error. Action: Not normally visible to the user. For further details, turn on tracing and reexecute the operation. If error persists, contact Worldwide Customer Support. ORA-12152: TNS:unable to send oracle error 12541 break message Cause: Unable to send break message. Connection probably disconnected. Action: Reestablish connection. oracle error 12154 encountered If the error is persistent, turn on tracing and reexecute the operation. ORA-12153: TNS:not connected Cause: Not currently connected to a remote oracle error 12560 host. Action: Reestablish connection. 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 oracle error 12154 10g 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. Action: - If you are using local naming (TNSNAMES.ORA file): - Make sure that "TNSNAMES" is listed as one of the values of
Oracle Error 12514
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 th
server but either failed to contact the server or did not find a matching service name on that server. TNS or 'Transparent Network Substrate' is a transport protocol that allows Oracle sessions to
Oracle Error 12154 Connect Identifier
communicate across a network. DB Server <=> Listener <=> Network connection <=> Client (SQL*Net) ora 12154 <=> Application. In the path above, tnsping can be used to test the parts in bold and should be the first oracle error 12545 troubleshooting step. If tnsping fails, that generally indicates a problem finding the server connection - if TNSNAMES specifies an IP address, is it correct?, if it's a DNS name, is that resolving correctly? (try switching https://docs.oracle.com/cd/B19306_01/server.102/b14219/net12150.htm for an IP address to find out.) If tnsping succeeds, that can indicate a problem with the client configuration but could equally be that the connection is working as far as the listener but the database is down. Try comparing with another PC - if multiple machines are failing that usually points towards a server issue. Ora-12154 can be a tricky problem to nail down because there are many possible causes, http://ss64.com/ora/syntax-ora-12154.html try making a connection directly on the server or completely regenerate the TNSNAMES.ORA file on the client. ORA-12154 description: 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. Action: 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 can make it unusable. 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 direct
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