ORA-12514, TNS:listener does not currently know of service requested in connect descriptor

这个错误通常是由于连接描述符中指定的服务名称与数据库中实际的服务名称不匹配引起的。可能的原因和解决方法如下：

1. 确认连接描述符中指定的服务名称是否正确，可以通过使用 lsnrctl status 命令查看监听器是否正在监听该服务。

2. 确认数据库实例是否已经启动，可以通过使用命令 sqlplus / as sysdba 登录到数据库并执行 startup 命令来启动实例。

3. 确认数据库实例中是否存在指定的服务，可以通过使用命令 lsnrctl services 来查看监听器中注册的所有服务。

4. 如果数据库实例中存在指定的服务，但是连接仍然无法建立，可能是由于网络连接或防火墙配置问题导致的，可以尝试使用 telnet 命令测试网络连接是否正常。

希望这些信息能帮到你解决问题。

相关问题

ORA-12514:TNS:listener does not currently know of service requested in connect descriptor Ora-12514

ORA-12514 is an error that occurs when the Oracle listener is not able to find the requested service in the connect descriptor provided. This error typically indicates that the service name or SID specified in the connection string is incorrect or not known by the listener.

To resolve this issue, you can try the following steps:

1. Verify the service name or SID: Double-check the service name or SID specified in the connect descriptor. Make sure it matches the service name or SID defined in the Oracle database.

2. Check listener status: Ensure that the Oracle listener is running and listening for incoming connections. You can use the following command to check the listener status:

   lsnrctl status

If the listener is not running, start it using the following command:

   lsnrctl start

3. Register the service: If the service name or SID is correct, but still not known by the listener, you can try registering the service manually with the following command:

   lsnrctl services

This command will reload the listener configuration and make it aware of any new services.

4. Check network connectivity: Ensure that there is no network issue between the client and the Oracle server. Check if you can ping the server from the client machine and vice versa.

If none of these steps resolve the ORA-12514 error, it might be helpful to provide more information about your specific setup, such as the version of Oracle Database, operating system, and how you are connecting to the database.

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

ORA-12514错误表示TNS监听器无法识别连接描述符中请求的服务。这可能是由于服务名或别名错误、服务未启动或监听器未配置正确等原因引起的。以下是解决此错误的一些方法：

1.检查服务名或别名是否正确。可以使用lsnrctl命令检查监听器是否正在监听请求的服务。

2.确保服务已启动。可以使用lsnrctl status命令检查监听器状态，并使用sqlplus命令连接到数据库以检查服务是否正在运行。

3.检查连接描述符中的主机名和端口号是否正确。

4.检查tnsnames.ora文件中的连接描述符是否正确配置。

5.如果使用的是Oracle RAC集群，请确保所有节点上的服务名称都相同。

以下是一个示例tnsnames.ora文件中的连接描述符：

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )