Observations on optimistic concurrency control schemes
Information Systems - Special issue: Databases:8Mtheir creation, management and utilization
Concurrency control and recovery in database systems
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Concurrency control for distributed real-time databases
ACM SIGMOD Record - Special Issue on Real-Time Database Systems
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ACM Transactions on Database Systems (TODS)
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Real-Time Systems - Special issue: real-time databases
Priority inheritance in soft real-time databases
Real-Time Systems - Special issue: real-time databases
Distributed and Parallel Databases - Special issue: Research topics in distributed and parallel databases
A token-based synchronization scheme for distributed real-time databases
Information Systems
Performance of concurrency control algorithms for real-time database systems
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On being optimistic about real-time constraints
PODS '90 Proceedings of the ninth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
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ANSS '92 Proceedings of the 25th annual symposium on Simulation
On optimistic methods for concurrency control
ACM Transactions on Database Systems (TODS)
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IEEE Transactions on Computers
Scheduling Real-time Transactions: a Performance Evaluation
VLDB '88 Proceedings of the 14th International Conference on Very Large Data Bases
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VLDB '91 Proceedings of the 17th International Conference on Very Large Data Bases
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Real-time optimistic concurrency control protocol with dynamic adjustment of serialization order
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Journal of Computer Science and Technology
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Distributed and Parallel Databases
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Inthis paper, we study the performance of using optimistic approachto concurrency control in distributed real-time database systems(RTDBS). The traditional optimistic approach suffers from theproblem of unnecessary restarts. Transaction restarts can significantlyincrease the system workload and intensify resource and datacontention. In distributed environments, the complexity of thesystem and the high communication overhead exacerbate the problem.Therefore, the number of unnecessary restarts is the determinantfactor that affects the performance of optimistic approach indistributed RTDBS. When optimistic approach is extended to distributedenvironments, a number of issues resulting from the increasedcomplexity and communication overhead have to be resolved. Inthis paper, a new real-time distributed optimistic concurrencycontrol (DOCC) protocol with dynamic adjustment of serializationorder (DASO), called DOCC-DA is proposed. This protocol can avoidunnecessary transaction restarts by dynamically adjusting theserialization order of the conflicting transactions. Therefore,resources can be saved and more transactions can meet their deadlines.In the DOCC-DA protocol, a new distributed circular validationscheme is included to facilitate transaction validation in distributedenvironments. The performance of the DOCC-DA protocol has beenexamined in detail by simulation. The results showed that theperformance of the DOCC-DA protocol is consistently better thanthat of other protocols.