MySQL 1140: Error closing file.

What is MySQL 1140: Error closing file.

Check the MySQL error log for more details on the error. This can be done by locating the error log file, which is typically named `hostname.err` in the data directory of your MySQL server. Use the command `SHOW VARIABLES LIKE 'log_error';` in your MySQL client to find the path to this file.

Verify the available disk space on the server to ensure the MySQL server has sufficient space to operate. You can do this by running the command `df -h` on the server's terminal.

Check the file permissions of the MySQL data directory to ensure that the MySQL server has the necessary permissions to write to the files. Use the command `ls -l /path/to/mysql/data/directory` to check the permissions, replacing `/path/to/mysql/data/directory` with the actual path to your MySQL data directory.

Ensure that there are no limits being exceeded, such as open file limits, by checking the current limits for the MySQL process with the command `ulimit -a` and comparing them to the needs of your MySQL server operations.

If operating within a virtualized or shared environment, ensure that no external processes or limitations imposed by the hosting environment (like inode limits) are affecting the MySQL server's ability to function properly.

6. Attempt to manually close the file (if identified) outside of MySQL, ensuring that no processes are locking it. Use commands like `lsof /path/to/problematic/file` to see if any process is using the file and `kill -9 PID` (with PID being the process id found with `lsof`) to forcibly close it if necessary.