MySQL connection error 1135, how to solve it?

MySQL connection error 1135, how to solve it?

MySQL is an open source relational database management system that is widely used in various websites and applications. However, sometimes we encounter some errors when connecting to the MySQL database, one of the common errors is the 1135 error. In this article, we will discuss the causes of 1135 error and how to fix it.

First, let’s understand what the 1135 error means. When we try to connect to the MySQL database, we may encounter an error message similar to "ERROR 1135 (HY000): Can't create a new thread (errno 11); if you are not out of available memory, you can consult the manual for a possible OS-dependent bug" error message. This error message usually means that the MySQL server has reached its maximum number of connections and can no longer handle new connection requests.

So, how to solve the 1135 error? Here are some possible solutions:

1. Increase the maximum number of connections (max_connections): You can increase the maximum number of connections by modifying the MySQL configuration file. First, find the my.cnf (or my.ini) file, which is the MySQL configuration file. Then, find the [mysqld] section and add it to the end of the file if it does not exist. In the [mysqld] section, add or modify the max_connections item and set it to a value greater than the current maximum number of connections. Finally, restart the MySQL server for the changes to take effect.
2. Optimize database connections: Sometimes, we can solve the 1135 error by reducing the number of connections by optimizing database connections. You can consider using connection pool technology, such as using a connection pool library (such as HikariCP, C3P0, etc.) to reuse database connections. The connection pool can manage the allocation and release of connections, thereby reducing the process of connection creation and destruction. In addition, you can also check whether there are closed database connections in the code and release connection resources in a timely manner.
3. Check server resources and performance: In some cases, if the server's resources (such as memory, CPU) are insufficient or its performance is poor, it may also cause the 1135 error. Therefore, you can check the resource usage of the server to ensure that there are enough resources available for MySQL to use. If the server performance is poor, consider upgrading the hardware or optimizing the server configuration.
4. Check network connection: Network failure may also cause 1135 error. You can check whether the network connection is normal and whether there are network delays or disconnections. If there is a network problem, you need to resolve the network fault and try the connection again.

To sum up, the key to solving MySQL connection error 1135 is to increase the maximum number of connections, optimize connections, check server resources and performance, and check network connections. Depending on the situation, an appropriate solution can be chosen to resolve the issue. In addition, you can also refer to the official MySQL documentation or seek help from the MySQL community for more detailed solutions.

Finally, before making any modifications, it is recommended to back up the MySQL database to prevent data loss or damage. At the same time, remember to read the relevant documentation carefully before making any system modifications to ensure correct and safe operation.

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