Why do I get a 'read ECONNRESET' error in my Node.js MySQL application after idle time?

MySQL read ECONNRESET Error after Idle Time on Node.js Server

Node.js applications interacting with MySQL via node-mysql often encounter the "read ECONNRESET" error after idle time. This issue prompts several questions:

1. Disconnect of Node's Connection to MySQL Server?

Yes, the error suggests a disconnection between Node and MySQL servers. MySQL has a "wait_timeout" variable that determines the idle time limit before closing connections. The default is 8 hours.

2. Inability of Connection Pools to Handle Disconnections?

Although node-mysql uses connection pools, it doesn't automatically prune disconnected connections. The issue may remain undetected until a query is attempted.

3. Exploring Other Error Sources?

While the "read ECONNRESET" error is common, it's worthwhile to rule out other potential causes beyond MySQL.

Solutions:

To address this issue:

1. Increase wait_timeout: Set MySQL's "wait_timeout" to a higher value (e.g., 28800 seconds) to prevent connections from being terminated.
2. Implement a Heartbeat: Periodically execute a query like "SELECT 1;" to keep the connection alive. Alternatively, use the node-pool module with the "idleTimeoutMillis" option.
3. Use Connection Pools: Connection pools like node-pool can automatically prune idle connections, ensuring active connections are maintained.

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