Equivalent of apt-get purge for yum

[Johan Dindaine]

I am looking for the equivalent of apt-get purge for yum to reinstall
completely mysql-server package.
What happend is I did install mysql-server then I added Remi
repository to get a later version of mysql and since then, installing
mysql is never complete.
For exemple I don't have my.cnf configuration file anywhere in the file system.
So I am looking for the equivalent of apt-get pure to completely
remove everything from the previous installation and start all over
again.

Could someone advice me on how to do so?
Many thanks to you.