Why does my Node.js server lose its MySQL connection after being idle?

MySQL Disconnects After Node.js Server Idle Time: Determining the Cause and Resolving Gracefully

Node.js developers often encounter the "read ECONNRESET" error when using the node-mysql module to connect to MySQL. This error typically occurs after the Node server has been idle for a certain period of time.

Determining the Cause

This error suggests that the connection between Node and MySQL has been disconnected. MySQL has a default connection lifetime limit, which can be configured through the "wait_timeout" variable. The default value is 8 hours. If the idle time exceeds this limit, MySQL will prune the connection.

Addressing the Issue

To resolve this issue, two approaches can be taken:

1. Increase MySQL Connection Lifetime Limit:

   • Increase the "wait_timeout" variable to a higher value, such as 28800 seconds (8 hours). This will extend the connection lifetime and prevent disconnections due to idle time.

2. Use Heartbeat or Node-Pool Module:

   • Use a heartbeat query (e.g., "SELECT 1;") to keep the connection alive periodically.
   • Utilize the node-pool module with the "idleTimeoutMillis" option to automatically remove idle connections from the pool.

Further Considerations

While other factors, such as database or network issues, may also contribute to the "read ECONNRESET" error, increasing MySQL's connection lifetime limit or implementing heartbeat mechanisms with node-pool should resolve the issue in most cases. If the error persists, consider troubleshooting other potential causes.

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