✔️ SOLVED ERROR ora-12514: tns:listener does not currently know of service requested in connect descriptor

What is ora-12514 Error

ora-12514: tns:listener does not currently know of service requested in connect descriptor – The ORA-12514 error message in Oracle database management system indicates that the listener could not resolve the service name specified in the connection descriptor. This error usually occurs when the connection string in the client application does not match with the service name specified in the listener.ora file or when the service name specified in the connection string is incorrect. To resolve this issue, check the service name specified in the connection string and the listener.ora file and make sure they match.

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how to prevent ora-12514 error

To prevent the ORA-12514 error in Oracle, you can follow these steps:

  1. Verify the service name: Make sure the service name specified in the connection string is correct and matches the service name specified in the listener.ora file.
  2. Check the listener.ora file: Ensure that the listener.ora file is configured correctly and contains the correct service name and host information.
  3. Start the listener: Verify that the listener is up and running by using the “lsnrctl status” command. If the listener is not running, start it using the “lsnrctl start” command.
  4. Restart the database: If the listener is running but you still encounter the ORA-12514 error, restart the database to refresh the connection information.
  5. Check firewall settings: Make sure the firewall is not blocking the connection between the client and the database.

By following these steps, you can prevent the ORA-12514 error in your Oracle database.

ora-12514: tns:listener does not currently know of service requested in connect descriptor

The “ORA-12514: TNS: listener does not currently know of service requested in connect descriptor” error message indicates that the service specified in the connection string is not recognized by the listener. This can occur for several reasons:

  1. Incorrect service name: Verify that the service name specified in the connection string is correct and matches the service name defined in the listener.ora file.
  2. Listener not running: Ensure that the listener is up and running by using the “lsnrctl status” command. If the listener is not running, start it using the “lsnrctl start” command.
  3. Listener not configured properly: Check the listener.ora file and make sure it is configured correctly and contains the correct service name and host information.
  4. Database not registered with the listener: If the database was recently created or the service name has changed, you may need to re-register the database with the listener using the “lsnrctl reload” command.

By addressing these issues, you can resolve the “ORA-12514: TNS: listener does not currently know of service requested in connect descriptor” error.

Also read ORA-00910-Column-Ambiguously-Defined

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