I am guessing that that rpm is for a different operating system
from the mysql site it is a fedora 17 rpm
And that is very incompatible with RHEL6.3
There is a reason you are using Red Hat -- it is VERY stable .
That entails that the versions of programs are a bit "old" .Old BUT patched with the current security patches .
also the version of a program will NEVER
change over the life time of the os ( for RHEL 6 that is 10 years )
you could always build from source ,then using "rpm-build" convert it to a rpm package for install.
There is a "src" source code rpm for RHEL6
you will need to build the program