How to solve MySQL connection error 1203?

MySQL connection error 1203, how to solve it?

MySQL is a widely used relational database management system, but when using MySQL, some connection errors may occur. One of the common errors is error code 1203, which indicates that the database connection has been interrupted. When you encounter this error, there are some steps you can take to resolve the issue.

First, we need to determine the exact cause of error 1203. This error is usually caused by a connection timeout or too many connections. Connection timeouts may be caused by heavy load on the database server or unstable network. The problem of too many connections may be caused by the number of concurrent connections exceeding the maximum number of connections limit of the database server.

The first step to solve this problem is to adjust the MySQL connection timeout setting. The connection timeout can be changed by modifying the MySQL configuration file. Find the my.cnf file (usually located in the /etc/mysql directory) and find the [mysqld] section. Add or modify the following lines:

interactive_timeout = 300
wait_timeout = 300

This will set the connection timeout to 300 seconds (5 minutes). These values ​​can be adjusted appropriately according to the actual situation. After completing the modification, save the file and restart the MySQL service.

The second step is to check whether the number of concurrent connections exceeds the maximum number of connections limit of the database server. You can view the current number of connections by executing the following SQL query:

SHOW VARIABLES LIKE 'max_connections';

If the current number of connections is close to or exceeds the maximum number of connections limit, we can try to increase the maximum number of connections . This can be achieved by modifying the max_connections parameter in the my.cnf file. Find the [mysqld] section and add or modify the following line:

max_connections = 1000

Set the maximum number of connections to an appropriate value (for example, 1000). Save the file and restart the MySQL service.

If the above solutions do not work and you still encounter error 1203, you can try some other solutions. First, you can try restarting the MySQL service. This can be done by running the following command in the terminal:

sudo service mysql restart

Alternatively, you can try executing the following command in the MySQL client to disconnect all connections:

FLUSH HOSTS;

This will refresh the MySQL hosts list and disconnect all active connections. You can then try to reconnect to the database and check if there is still connection error 1203.

Finally, if all else fails, consider upgrading your MySQL version or contact the MySQL support team for help. They can provide more specific guidance to help resolve connection errors.

To summarize, MySQL connection error 1203 may be caused by connection timeout or too many connections. Methods to solve this problem include adjusting the connection timeout settings, increasing the maximum number of connections, restarting the MySQL service, refreshing the host list, etc. If none of these methods work, you can try upgrading your MySQL version or seeking professional support. Through the above measures, we can better solve MySQL connection error 1203 and ensure the stability and reliability of the database connection.

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