When encountering the error 1166: Error writing to file in MySQL, perform the following immediate actions:
df -h
This checks the available disk space on all mounted filesystems. If the disk is full, freeing up space or increasing disk size is required.
ls -l /path/to/mysql/data/directory
Replace `/path/to/mysql/data/directory` with the actual path. Ensure the files and directories have the correct owner (usually 'mysql' or 'mysqld').
tail -f /var/log/mysql/error.log
Adjust the path `/var/log/mysql/error.log` based on your MySQL configuration. Look for any errors related to disk space, permissions, or other issues concurrent with the error 1166.
mount | grep /path/to/mysql/data
Replace `/path/to/mysql/data` with the actual data directory. Look for `(ro,` in the output, indicating a read-only mount.
SHOW ENGINE INNODB STATUS;
Look in the 'LATEST FOREIGN KEY ERROR' and 'LATEST DETECTED DEADLOCK' sections for any relevant errors.
REPAIR TABLE tablename;
Replace `tablename` with the name of the affected table.
Perform these actions sequentially to diagnose and potentially resolve the "Error 1166: Error writing to file" in MySQL.
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