mysql Variable 'secure_file priv' is a read only variable

MySQL's "secure_file_priv" system variable determines the directory location where the LOAD DATA INFILE and SELECT INTO OUTFILE statements can read and write files. By default, this variable is set to the empty string (''), which means that these statements can access any file on the server.

If you are getting the "Variable 'secure_file_priv' is a read-only variable" error, it means that you are trying to change the value of this variable, which is not allowed. This error typically occurs when you try to set the "secure_file_priv" variable using the SET command or by modifying the my.cnf configuration file.

To solve this problem, you need to modify the "secure_file_priv" variable in the MySQL configuration file (my.cnf) and restart the MySQL server. Here are the steps:

1. Open the my.cnf configuration file in a text editor.

2. Locate the line that sets the "secure_file_priv" variable. If the line is commented out (with a # at the beginning), remove the # to uncomment it.

3. Set the "secure_file_priv" variable to the directory location where you want to allow access to files. For example, you can set it to "/var/lib/mysql-files".

4. Save the my.cnf configuration file.

5. Restart the MySQL server for the changes to take effect.

After following these steps, you should be able to use the LOAD DATA INFILE and SELECT INTO OUTFILE statements without getting the "Variable 'secure_file_priv' is a read-only variable" error.