To set a SESSION variable to the GLOBAL value or a GLOBAL value to the compiled-in MySQL default value, use the DEFAULT keyword. See http://dev.mysql.com/doc/refman/5.7/en/set-statement.html
To set a SESSION variable to the GLOBAL value or a GLOBAL value to the compiled-in MySQL default value, use the DEFAULT keyword. See http://dev.mysql.com/doc/refman/5.7/en/set-statement.html