QoS management for real-time DataBases in embedded systems
Proceedings of the 2008 Euro American Conference on Telematics and Information Systems
Data management for component-based embedded real-time systems: The database proxy approach
Journal of Systems and Software
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In this paper we present a concurrency control algorithmthat allows co-existence of soft real-time, relationaldatabase transactions, and hard real-time database pointertransactions in real-time database management systems.The algorithm uses traditional pessimistic concurrency-control(i.e. locking) for soft transactions and versioningfor hard transactions to allow them to execute regardlessof any database lock. We provide formal proof that the algorithmis deadlock free and formally verify that transactionshave atomic semantics. We also present an evaluationthat demonstrates significant benefits for both soft and hardtransactions when our algorithm is used. The proposed algorithmis suited for resource-constrained safety critical,real-time systems that have a mix of hard real-time controlapplications and soft real-time management, maintenance,or user-interface applications.