MySQL 1138: Error reading file.

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What is

MySQL 1138: Error reading file.

 ?
  1. Check Disk Space: The error might be due to insufficient disk space. Run the command `df -h` to check available disk space. Ensure there's enough space for MySQL operations.



  1. Check File Permissions: Incorrect file permissions can cause this error. Ensure the MySQL user has the necessary permissions to read the file. Use `ls -l /path/to/problematic/file` to check permissions and `chown mysql:mysql /path/to/problematic/file` to correct them, replacing `/path/to/problematic/file` with the actual file path.



  1. Verify the File's Integrity: The file might be corrupted. If it's a table, run `CHECK TABLE tablename;` replacing `tablename` with the name of the table you're having issues with. For other files, try accessing them with suitable tools or commands based on the file type.



  1. Review MySQL Error Log: The MySQL error log can provide more details about the error. Check the log by finding its location from the MySQL configuration file (usually `my.cnf` or `my.ini`) and then use `cat /path/to/mysql/log` to view it, replacing `/path/to/mysql/log` with the actual log file path.



  1. Increase the `readbuffersize` Parameter: If the error relates to reading large files, increasing the `readbuffersize` parameter in MySQL might help. Set it dynamically by running `SET GLOBAL readbuffersize = 1048576;` for a session or adjust it permanently in the `my.cnf` (or `my.ini`) configuration file.



  1. Repair Table: If the error is related to a specific table and you've determined it's corrupted, use the `REPAIR TABLE tablename;` command, replacing `tablename` with the name of the corrupted table.



  1. Check for Operating System Errors: Sometimes, the issue might not be with MySQL but with the underlying operating system. Check the system logs for any I/O errors or filesystem issues.



  1. Restart MySQL Service: If permissible, restarting the MySQL service can sometimes resolve transient issues. Use `sudo systemctl restart mysql` on systems using `systemd` or `sudo service mysql restart` on systems using `init.d`.



Each action should be considered in the context of your environment and the specifics of the error you're encountering.

Attached error: 
MySQL 1138: Error reading file.
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