Recent works on Real-Time (RT) databases are focused on
simulations. These studies present shortcomings not only in
verification but also in comparison with existing core techniques
used for the management of RT databases. Besides, RT database
applications are challenged by the lack of an RT database system
open source to perform a realistic environment. In this paper, a
design based on a open-source object-oriented environment
database system is proposed for the RT database application
development. The proposed system is based on the RTQL (Real-
Time Query Language) which is defined as a high-level RT
object-oriented query language. It supports the expression of
timing constraints on data and it ensures transactions upon the
data. Then, a QoS management approach is performed to reduce
workloads and to detect overload. The proposed attempt is
supported by the use of the feedback control RT scheduling
theory. Our evaluation shows that our approach not only achieves
the desired timeliness of transactions but also maintains high data
freshness compared with other related approaches.