A study of two transaction-processing architectures for distributed real-time data base systems
Journal of Systems and Software
A two-phase approach to predictably scheduling real-time transactions
Performance of concurrency control mechanisms in centralized database systems
Real-Time Transaction Management in Mobile Computing Systems
DASFAA '99 Proceedings of the Sixth International Conference on Database Systems for Advanced Applications
Supporting predictability in real-time database systems
RTAS '96 Proceedings of the 2nd IEEE Real-Time Technology and Applications Symposium (RTAS '96)
Broadcast on Demand: Efficient and Timely Dissemination of Data in Mobile Environments
RTAS '97 Proceedings of the 3rd IEEE Real-Time Technology and Applications Symposium (RTAS '97)
Scheduling transactions with temporal constraints: exploiting data semantics
RTSS '96 Proceedings of the 17th IEEE Real-Time Systems Symposium
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Due to the unpredictability of mobile network, it is difficult to meet transaction deadlines in a mobile distributed real-time database system (MDRDTBS). We propose the idea of transaction shipping to reduce the overheads in processing a transaction over mobile network and in resolving priority inversion. We consider a distributed lock-based real-time protocol, the Distributed High Priority Two Phase Locking (DHP-2PL), to study the impacts of mobile network on real-time data access. A detailed model of a MDRTDBS has been developed, and a series of simulation experiments have been performed to evaluate the performance of our approach.