* Konra Wawryn: > I`m searching for some solution which will help me to scale my system > in the future.
You provided very little information about your requirements, and "to scale" is just as vague a term. Hence, I recommend an LDAP server, because it works in many scenarios, can accommodate thousands of users, and is basically the default solution for this type of write-seldom- read-often type of user data storage. As for MySQL, I would personally not use it for authentication unless I had no other option. -Ralph