Bruno Sadeg

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Real-time databases deal with time-constrained data and time-constrained transactions. The design of this kind of databases requires the introduction of new concepts to support both data structures and the dynamic behaviour of the database. In this paper, we give an overview about different aspects of real-time databases and we clarify requirements of their(More)
These recent years, a lot of real-time applications are becoming increasingly sophisticated in their data needs, resulting in a greater demand for real-time data services. Real-time database systems (RTDBS) can manage these applications, but the workload in these systems is unpredictable , then RTDBS may become overloaded. A lot of work dealing with quality(More)
In current research toward the design of more powerful behavior of RTDBS under unpredictable workloads, different research groups focus their work on QoS (Quality of Service) guarantee. Their research are often based on feedback control real-time scheduling theory. In this paper , we propose a technique which allows to execute transactions on time using(More)
Le critère de sérialisabilité, reconnu comme le critère de correction des transactions dans les SGBD (Systèmes de Gestion de Bases de Données) traditionnels, est difficilement applicable dans un contexte temps réel. Ce critère s'avère trop strict pour l'exécution des transactions et pour l'accès aux données temps réel. L'epsilon-sérialisabilité est un(More)
The design of Real-Time (RT) applications is a difficult task since it must take into account the specification of time-constrained data and time-constrained transactions. The design of these applications can be facilitated through the reuse of RT design patterns that improve software quality and capture RT domain knowledge and design expertise. However,(More)
Due to the diversity of extended transaction models, their relative complexity and their lack of formalization, the characterization and comparison of these models become delicate. Moreover, these models capture only one subset of interaction which can be found in the spectrum of the possible interaction. In front of this established fact, the framework(More)