Error
Error Code:
2
MySQL Error 2: File Read Access Error
Description
This error indicates that the MySQL server encountered an issue while attempting to read a required file on the operating system. It typically occurs when MySQL lacks the necessary permissions, the file is missing, or the file is corrupted, preventing the database from accessing critical data or configuration.
Error Message
Error reading file '%s' (OS errno %d - %s)
Known Causes
4 known causesInsufficient File Permissions
The MySQL server process does not have the necessary read permissions for the specified file or its containing directory on the operating system.
Missing or Incorrect File Path
The file MySQL is attempting to read either does not exist at the specified location or the path configured for MySQL is incorrect or outdated.
Corrupted File
The target file exists but is corrupted or damaged, making it unreadable by the operating system and subsequently by MySQL.
Underlying Disk/Filesystem Issue
Problems with the underlying disk, storage device, or filesystem (e.g., full disk, bad sectors) prevent the file from being read correctly.
Solutions
3 solutions available1. Verify File Permissions for MySQL User easy
Ensure the MySQL server process has read access to the specified file.
1
Identify the user the MySQL server is running as. This is often 'mysql' or a dedicated user.
ps aux | grep mysqld2
Locate the file that MySQL is trying to read (indicated by '%s' in the error message).
3
Check the permissions of the file using the `ls -l` command. The first column shows permissions.
ls -l /path/to/your/file4
If the MySQL user does not have read permissions, grant them using `chmod`. For example, to grant read permission to the owner and group:
sudo chown mysql:mysql /path/to/your/file
sudo chmod 644 /path/to/your/file5
Restart the MySQL server to apply permission changes.
sudo systemctl restart mysql2. Check File Existence and Path easy
Confirm that the file MySQL is trying to access actually exists and the path is correct.
1
Examine the full path to the file mentioned in the error message ('%s').
2
Verify that the file exists at the specified location using the `ls` command.
ls -l /path/to/your/file3
If the file is missing, restore it from a backup or recreate it if it's a configuration file.
4
If the path is incorrect, update the MySQL configuration or the command/query that is referencing the wrong path.
3. Review MySQL Data Directory and Configuration medium
Ensure the MySQL data directory and related configuration files have correct ownership and permissions.
1
Locate your MySQL data directory. This is typically specified by the `datadir` variable in your `my.cnf` or `my.ini` file.
grep datadir /etc/mysql/my.cnf2
Check the ownership and permissions of the data directory and its contents. The MySQL user (e.g., 'mysql') should own these.
sudo chown -R mysql:mysql /var/lib/mysql
sudo chmod -R 755 /var/lib/mysql3
If you are loading data from a file (e.g., `LOAD DATA INFILE`), ensure the file is accessible by the MySQL server process and that `secure_file_priv` is configured appropriately.
SHOW VARIABLES LIKE 'secure_file_priv';4
If `secure_file_priv` is set to a specific directory, place your input file within that directory. If it's empty, MySQL might default to the data directory or disallow file operations for security reasons.
5
Restart the MySQL server after making any changes to ownership or permissions.
sudo systemctl restart mysql