Hello,

I know, it's certainly nothing to do with your repo :

yum --enablerepo=remi,remi-test install mysql mysql-server
Loaded plugins: product-id, refresh-packagekit, rhnplugin, security, subscription-manager
Updating certificate-based repositories.
Unable to read consumer identity
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package mysql.x86_64 0:5.5.36-1.el6.remi will be installed
--> Processing Dependency: real-mysql-libs(x86-64) = 5.5.36-1.el6.remi for package: mysql-5.5.36-1.el6.remi.x86_64
---> Package mysql-server.x86_64 0:5.5.36-1.el6.remi will be installed
--> Processing Dependency: perl-DBD-MySQL for package: mysql-server-5.5.36-1.el6.remi.x86_64
--> Processing Dependency: libz.so.1(ZLIB_1.2.0)(64bit) for package: mysql-server-5.5.36-1.el6.remi.x86_64
--> Running transaction check
---> Package mysql-libs.x86_64 0:5.1.61-4.el6 will be updated
--> Processing Dependency: libmysqlclient.so.16()(64bit) for package: perl-DBD-MySQL-4.013-3.el6.x86_64
--> Processing Dependency: libmysqlclient.so.16()(64bit) for package: 2:postfix-2.6.6-2.2.el6_1.x86_64
--> Processing Dependency: libmysqlclient.so.16(libmysqlclient_16)(64bit) for package: perl-DBD-MySQL-4.013-3.el6.x86_64
--> Processing Dependency: libmysqlclient.so.16(libmysqlclient_16)(64bit) for package: 2:postfix-2.6.6-2.2.el6_1.x86_64
---> Package mysql-libs.x86_64 0:5.5.36-1.el6.remi will be an update
---> Package mysql-server.x86_64 0:5.5.36-1.el6.remi will be installed
--> Processing Dependency: libz.so.1(ZLIB_1.2.0)(64bit) for package: mysql-server-5.5.36-1.el6.remi.x86_64
---> Package perl-DBD-MySQL.x86_64 0:4.013-3.el6 will be installed
--> Running transaction check
---> Package compat-mysql51.x86_64 0:5.1.54-1.el6.remi will be installed
---> Package mysql-server.x86_64 0:5.5.36-1.el6.remi will be installed
--> Processing Dependency: libz.so.1(ZLIB_1.2.0)(64bit) for package: mysql-server-5.5.36-1.el6.remi.x86_64
--> Finished Dependency Resolution
Error: Package: mysql-server-5.5.36-1.el6.remi.x86_64 (remi)
           Requires: libz.so.1(ZLIB_1.2.0)(64bit)
You could try using --skip-broken to work around the problem
** Found 1 pre-existing rpmdb problem(s), 'yum check' output follows:
openssl-1.0.1e-15.el6.x86_64 is a duplicate with openssl-1.0.0-20.el6_2.5.x86_64 <= if any idea to solve it too

I installed Mysql 5.1 without this problem, any idea?