Installing MySQL in Linux is not a difficult task; here's the step by step guide on how to do it:
In CentOS you might not have perl-DBI installed:
yum install perl-DBI
rpm -ivh MySQL-server-XXXXXX.rpm
rpm -ivh MySQL-client-XXXXXX.rpm
rpm -ivh MySQL-devel-XXXXXX.rpm
mysqladmin -u root password 'new-password'
mysqladmin -u root -h <computer name>.<localdomain> password 'new-password' -p
tar xvfz mysql-gui-tools-XXXXXX.tar.gz
rpm -ivh mysql-gui-tools-XXXXXX.rpm
rpm -ivh mysql-administrator-XXXXXX.rpm
rpm -ivh mysql-query-browser-XXXXXX.rpm
GRANT ALL PRIVILEGES ON *.* TO 'mertech'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;