ora-12505, tns:listener does not currently know of sid given in connect descriptor

这是一个Oracle数据库错误，其中"ora-12505"是错误代码，"tns:listener"是错误组件，"sid"是连接描述符中给定的服务标识符。这个错误的原因通常是由于数据库服务没有正确配置或没有正确启动，或者连接字符串中给定的SID是错误的。如果你知道如何维护你的数据库，建议你检查数据库服务是否正常启动，并确保连接字符串中给出的SID是正确的。

相关问题

ORA-12505: TNS:listener does not currently know of SID given in connect descriptor

ORA-12505: TNS:listener does not currently know of SID given in connect descriptor 是一个Oracle数据库连接错误。它的原因是监听器不知道给定的SID在连接描述符中。这通常是由于配置问题或者网络问题导致的。

要解决这个问题，你可以尝试以下方法：
1. 确保连接描述符中的SID与数据库实例的SID匹配。可以通过执行命令`SELECT instance_name FROM V$INSTANCE;`来获取数据库实例的SID。
2. 检查监听器配置文件（listener.ora）中的SID是否正确配置。确保SID与数据库实例的SID一致。
3. 检查监听器是否正在运行。可以通过执行命令`lsnrctl status`来检查监听器的状态。如果监听器没有运行，可以使用命令`lsnrctl start`启动监听器。
4. 检查网络连接是否正常。确保客户端能够访问到数据库服务器的监听器端口。

如果以上方法都没能解决问题，你可能需要进一步检查网络配置、防火墙设置等。

ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

This error message indicates that the Oracle listener service is not aware of the SID (System Identifier) specified in the connection descriptor. This can happen due to several reasons, including:

1. The SID specified in the connection descriptor is incorrect or misspelled.
2. The listener service is not running or is not configured to listen for the specified SID.
3. The listener service is running on a different machine than the database server, and the connection descriptor is pointing to the wrong IP address or hostname.

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

1. Verify that the SID specified in the connection descriptor is correct and matches the SID of the database instance.
2. Verify that the listener service is running and listening for the specified SID. You can check this by running the command "lsnrctl status" on the database server.
3. If the listener service is running on a different machine, make sure that the connection descriptor is pointing to the correct IP address or hostname.

If none of these steps resolve the issue, you may need to consult the Oracle documentation or contact Oracle support for further assistance.