Scheduling real-time transactions: a performance evaluation
ACM Transactions on Database Systems (TODS)
Predictability and consistency in real-time database systems
Advances in real-time systems
A secure concurrency control protocol for real-time databases
Proceedings of the ninth annual IFIP TC11 WG11.3 working conference on Database security IX : status and prospects: status and prospects
Database Concurrency Control in Multilevel Secure Database Management Systems
IEEE Transactions on Knowledge and Data Engineering
Supporting security requirements in multilevel real-time databases
SP '95 Proceedings of the 1995 IEEE Symposium on Security and Privacy
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Concurrency control for real-time secure database systems must satisfy not only logical data consistency but also timing constraints and security requirements associated with transactions. These conflicting natures between timing constraints and security requirements are often resolved by maintaining several versions (or secondary copies) on the same data items. In this paper, we propose a new lock-based concurrency control protocol, Secure Dynamic Copy Protocol, ensuring both conflicting requirements. Our protocol aims for reducing the storage overhead of maintaining secondary copies and minimizing the processing overhead of update history. The main idea of our protocol is to keep a secondary copy only when it is needed to resolve the conflicting read/write operations in real time secure database systems. For doing this, a secondary copy is dynamically created and removed during a transaction's read/write operations. While comparing the existing real-time security protocol, we have also examined the performance characteristics of our protocol through simulation under different workloads. The results show that our protocol consumed less storage and decreased the deadline missing transactions.