Solution to Oracle listening server failure

Due to the failure of the Oracle database listening server, the database may not be accessible normally, affecting the use of the database. This article will introduce some possible causes and solutions for Oracle listening server failure, and attach specific code examples.

1. Possible reasons for the failure of the listening server

1. The listening service is not started
2. The listening configuration file error
3. Network connection failure
4. Firewall blocks the listening port

2. Solution

2.1. Make sure the listening service is started

Run the following command on the database server to start the listening service:

lsnrctl start

2.2. Check the listening configuration file

Check whether the listening configuration filelistener.ora is configured correctly and ensure that the listening address and port are set correctly. If there are changes, you need to restart the listening service:

lsnrctl stop
lsnrctl start

2.3. Check the network connection

Use the ping command to check whether the network connection between the database server and the client is normal. If the network connection fails, the network problem needs to be repaired in time.

2.4. Check the firewall settings

Check the firewall settings to ensure that the listening port is not blocked by the firewall. If it is blocked, you need to add corresponding firewall rules to allow communication on the listening port:

iptables -I INPUT -p tcp --dport 监听端口号 -j ACCEPT
service iptables restart

3. Code example: Restart the listening service

If you encounter the problem of listening server failure, you can use the following code Example of restarting the listening service:

lsnrctl stop
lsnrctl start

Conclusion

Through the above methods and code examples, you can solve the problem of Oracle listening server failure and ensure normal access to the database. In practical applications, monitoring failures must be checked and handled in a timely manner to ensure the stable operation of the database system.

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