Recently a new generation middle tiers has emerged. Thanks to this layer between database and application administrators have less work and users have more possibilities. Some middle tiers even create the possibility of 'time travel' in the corporate data. Both DBA’s and users are aware of a number of recurring problems when they are working with databases. These impede them in their work, are time-consuming and occasionally even make the work impossible. For many of these problems the solution has already existed for some time: the middle tier. Developers of databases are also aware of a number of recurring problems.