Why does mysql database automatically disconnect?

The reasons why the MySQL database automatically disconnects are: connection timeout: the connection will be closed when there is no activity (the wait_timeout variable can be adjusted); MySQL service reset: all connections are closed (check the log); network problems: required Check connection stability and firewall; client errors: exceptions or errors can cause disconnects; high load: server closes connections to release resources; configuration errors: check configuration files; driver issues: use the latest version and check compatibility.

The reason why MySQL database automatically disconnects

1. Connection timeout

• The default connection timeout for MySQL is 8 hours.
• If the connection is idle (no query) for a long time, it will be closed automatically.
• You can increase the connection timeout by setting the wait_timeout variable.

2. MySQL service reset

• MySQL service reset will close all existing connections.
• This is usually caused by a software update, server restart, or unexpected shutdown.
• MySQL logs can be monitored to detect service resets.

3. Network problems

• Network interruption or instability will cause the MySQL connection to be disconnected.
• Check that the network connection is stable and troubleshoot any firewall or proxy server issues.

4. Client Disconnection

• Exceptions or errors in the application or client code may cause the MySQL connection to be disconnected.
• Check application logs or debug code to identify the root cause of the disconnection.

5. The database server load is too high

• If the database server load is too high, it may automatically close the connection to save resources.
• Monitor server metrics such as CPU and memory usage to identify load issues.

6. Incorrect Configuration

• MySQL configuration errors (such as incorrect max_connections settings) may cause connection problems Automatically disconnect.
• Check the MySQL configuration file and make sure it is configured correctly.

7. Driver issues

• Corrupt or outdated MySQL drivers can cause connection problems.
• Make sure to use the latest version of the driver and check for any known compatibility issues.

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