In context our paper, the fifth design in the standard model, distributed database, splits the database itself. This design is different from others in two ways. First, it describes distributed data, while the others describe distributed processing. The others aeronaut. This model is based on two-tier model in dividing application into three logical parts.
Physical parts is divided into client and n- servers.
Application server and resource manager can be located in one physical device. In implementation of this model transaction monitors as Transarc's Encina or USL's Tuxedo monitors are typical used as application server. The problem of model is significantly reduced into data logic, which is theoretically completely removed in three-tier model from the client. If the data schema is changed in the two-tier architecture, then clients cannot operate, because each client must have data logic. If the data schema is changed in the three-tier architecture, there is only one breakage point.