mysql grant privileges

mysql> CREATE USER 'user_name'@'localhost' IDENTIFIED BY 'password';
mysql> GRANT ALL PRIVILEGES ON database_name.* TO 'user_name'@'localhost' WITH GRANT OPTION;
mysql> CREATE USER 'user_name'@'%' IDENTIFIED BY 'password';
mysql> GRANT ALL PRIVILEGES ON database_name.* TO 'user_name'@'%' WITH GRANT OPTION;