Why am I getting a 'Error writing file '/tmp/MY1fnqpm' (Errcode: 28)' error in my MySQL query?

MySQL File Writing Error: Errcode 28

Issue:

While attempting to execute a web application query, an error message is encountered:

Error writing file '/tmp/MY1fnqpm' (Errcode: 28) ... INSERT MailList...

Possible Cause:

This error typically indicates an issue related to file writing operations. A potential suspect is insufficient disk space on the server.

Diagnostic and Resolution:

To confirm the diagnosis, use the perror command to determine the underlying system error code:

$ perror 28
OS error code  28:  No space left on device

Conclusion:

As the perror output suggests, the file system on the server has reached its capacity. To resolve the error, free up disk space by removing unnecessary files, optimizing MySQL tables, or expanding the storage volume.

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