How to solve MySQL connection error 1216?

How to deal with MySQL connection error 1216?

MySQL is a widely used open source relational database management system, but during use, you sometimes encounter connection error 1216. This error is usually caused by master-slave replication or partitioning operations. In this article, we will detail how to deal with MySQL connection error 1216.

First, let us understand what MySQL connection error 1216 is. This error usually occurs during master-slave replication or partitioning operations. It means that for some reason MySQL cannot create the required connection.

Now that we know that this error is usually related to master-slave replication or partition operations, we can try the following solutions:

1. Check the master-slave replication configuration: First, we need to make sure Master-slave replication is configured correctly. We can confirm the configuration information by checking the my.cnf files of the master and slave libraries. Make sure that the host names, port numbers, user names, and passwords of the master and slave libraries in the configuration file are correct. If any errors are found, make necessary changes and restart the MySQL service.

2. Check the master-slave status: Connection error 1216 is sometimes caused by inconsistent master-slave status synchronization. We can use the following command to check the master-slave status:

   SHOW SLAVE STATUSG

   In the results, we need to pay attention to the following important fields: Slave_IO_Running (indicates whether the slave library is running an IO thread), Slave_SQL_Running (indicates whether the slave library is running an IO thread) SQL thread is running), Seconds_Behind_Master (indicates the delay time between the slave library and the master library). If you find any anomalies in these fields, try restarting the slave database and reinitializing master-slave replication.

3. Make sure the partition operation is correct: If the connection error 1216 is related to the partition operation, we can try the following steps to solve the problem. First, we need to check whether the partitioning operation is correct. Make sure that all table-related operations, such as inserts, updates, and deletes, are closed before performing partition operations. Then, check whether the partition number and partition key of the partition table are set correctly. Finally, re-perform the partition operation and check if the connection error 1216 still exists.
4. Check MySQL logs: We can get more information about connection error 1216 by checking the MySQL error log. Viewing the error log can help us understand the specific cause of the error and take appropriate measures to solve the problem. We can set the error log path in the my.cnf file and then restart the MySQL service.

Finally, no matter which solution we take, we should make sure to make a backup before proceeding. This is very important as some workarounds may result in data loss or other unforeseen consequences. Therefore, before trying to resolve connection error 1216, make sure to take a full backup of your database.

Please keep the above points in mind when dealing with MySQL connection error 1216. We can usually resolve this connection error by checking the master-slave replication configuration, checking the master-slave status, making sure the partitioning is done correctly, and viewing the MySQL logs. Also, remember to make a backup before proceeding, just in case.

I hope this article will help you deal with MySQL connection error 1216!

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