When we install the new version of mysql in linux then, if there is any old version is existing, it will show some conflict. So we have to remove the old files before proceeding further. The following commands will help you to do this.

# rpm -qa | grep -i mysql
libdbi-dbd-mysql-0.6.5-7
MySQL-python-0.9.1-9
perl-DBD-MySQL-2.9002-1
mod_auth_mysql-20030510-3
php-mysql-4.3.3-6
mysql-3.23.58-4
mysql-bench-3.23.58-4
mysql-server-3.23.58-4
freeradius-mysql-0.9.1-1
mysql-devel-3.23.58-4
qt-MySQL-3.1.2-14

You will want to uninstall any release of MySQL before continueing with the installation of latest MySQL version.

You can use RPM to uninstall the above packages as follows:

# rpm -e libdbi-dbd-mysql
# rpm -e MySQL-python
# rpm -e mod_auth_mysql
# rpm -e php-mysql
# rpm -e mysql-bench
# rpm -e mysql-server
# rpm -e freeradius-mysql
# rpm -e mysql-devel
# rpm -e mysql perl-DBD-MySQL MyODBC qt-MySQL

In addition to removing all MySQL packages, you will also want to remove any mysql group and user that may already be created. The following command will remove both the mysql group as well as the mysql group:

# userdel mysql

Reference here

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