Performance can be defined as the ability of a system to deliver the results based on the request of the users, while keeping them satisfied. The key point to remember is satisfaction. If current database key indicators reveal that the database is running optimally, but users are not satisfied with the response times, is there a need for tuning? The answer is yes, (within reason, of course). Typically, if one looks closely enough, there is usually something that can be done to make users happier, or at least more educated.