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MySQL 1166: Error writing to file.
When encountering the error 1166: Error writing to file in MySQL, perform the following immediate actions:
- Check Disk Space: Ensure the server has enough disk space. Run the command:
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.
- Check Permissions: Verify that the MySQL user has write permissions to the directory and files it's trying to access. Run the command:
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').
- Review MySQL Error Log: The MySQL error log can provide specific details about why the write failed. Check the log with:
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.
- Check for Read-only Filesystem: Ensure the filesystem where MySQL writes its data isn't mounted as read-only. Run:
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.
- Check InnoDB Status: If the table uses InnoDB, there might be information related to the error in the InnoDB engine status. Run:
SHOW ENGINE INNODB STATUS;
Look in the 'LATEST FOREIGN KEY ERROR' and 'LATEST DETECTED DEADLOCK' sections for any relevant errors.
- Repair Table: If the issue is with a specific table and it's not InnoDB, you can attempt to repair it with:
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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