参考
http://saba.nitty-gritty.org/900misc/mysql.html
Install†
yum -y install mysql-server
/etc/init.d/mysqld start
mysql -u root
root のパスワード設定†
set password for root@localhost('new_password');
mysql -u root -p
ユーザの作成†
grant all privileges on userdb.* to user123@localhost identified by '(パスワード)';
quit;
mysql -u user123 -p Enter password: (user123のパスワード)
DBの作成†
create database userdb;