96 Int. J. Intelligent Information and Database Systems, Vol. 14, No. 1, 2021 Improving the quality of service of real-time database systems through a semantics-based scheduling strategy Fehima Achour* MIRACL Laboratory, The Higher Institute of Computer Science and Multimedia, P.B. 242, Sfax 3021, Tunisia Email: fehima.achour@gmail.com *Corresponding author Emna Bouazizi MIRACL Laboratory, The Higher Institute of Computer Science and Multimedia, P.B. 242, Sfax 3021, Tunisia and The College of Computer Science and Engineering, University of Jeddah, Jeddah, Saudi Arabia Email: AALTAHER@uj.edu.sa Wassim Jaziri MIRACL Laboratory, The Higher Institute of Computer Science and Multimedia, P.B. 242, Sfax 3021, Tunisia and The College of Computer Science and Engineering, Taibah University, Almadimah, KSA Email: jaziri.wassim@gmail.com Abstract: A real-time database management system (RTDBMS) aims to manage applications with a large number of data being accessed by update and user transactions having to meet some time constraints. We are interested in improving the quality of service (QoS) in RTDBMSs by optimising the execution of transactions to improve meeting their deadlines. A new scheduling strategy is developed and evaluated into a QoS management architecture called feedback control scheduling (FCS) proposed for RTDBMSs. The proposed strategy is based on the new advanced earliest deadline first based on transactions aggregation and data semantic links (AEDF-TAL-DSL) protocol we developed. It introduces new parameters relating to the aggregation links (defined according to the type of operations Copyright © 2021 Inderscience Enterprises Ltd.