ORA-12505 TNS:listener does not currently konw of sid given i
时间: 2023-11-23 21:56:25 浏览: 87
ORA-12505 TNS:listener does not currently know of SID given in connect descriptor错误通常是由于Oracle数据库实例的SID或服务名称不正确或未在监听器中注册引起的。解决此问题的方法包括:
1.检查连接描述符中的SID或服务名称是否正确。
2.检查监听器是否正在运行,并且数据库实例是否已在监听器中注册。
3.检查tnsnames.ora文件中的连接描述符是否正确。
4.检查防火墙设置是否允许连接到数据库实例的端口。
5.尝试使用IP地址而不是主机名连接到数据库实例。
以下是一个示例代码,可以用于连接到Oracle数据库实例并查询数据:
```python
import cx_Oracle
# 连接到Oracle数据库
dsn_tns = cx_Oracle.makedsn('localhost', '1521', service_name='ORCL')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
# 查询数据
cursor = conn.cursor()
cursor.execute('SELECT * FROM employees')
for row in cursor:
print(row)
# 关闭连接
cursor.close()
conn.close()
```
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 desc
This error message typically occurs when a user is attempting to connect to an Oracle database using an incorrect or invalid Service Identifier (SID) value. The SID is a unique identifier for a particular Oracle database instance and is used to connect to that instance.
To resolve this error, the user should verify that they are using the correct SID value when attempting to connect to the database. The SID value can typically be found in the tnsnames.ora file or can be obtained from the database administrator.
If the user is using the correct SID value and is still experiencing this error, they may need to check the Oracle listener configuration to ensure that the listener is properly configured to recognize the specified SID. The listener.ora file should be checked to verify that the SID is correctly specified and that the listener is running and listening for incoming connections.
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