Concurrency control and recovery in database systems
Concurrency control and recovery in database systems
Distributed and Parallel Databases - Special issue: Research topics in distributed and parallel databases
Principles of distributed database systems (2nd ed.)
Principles of distributed database systems (2nd ed.)
On being optimistic about real-time constraints
PODS '90 Proceedings of the ninth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
The PROMPT Real-Time Commit Protocol
IEEE Transactions on Parallel and Distributed Systems
Real-Time Database Systems in the New Millenium
Real-Time Systems
Value-cognizant Speculative Concurrency Control
VLDB '95 Proceedings of the 21th International Conference on Very Large Data Bases
Performance Evaluation of Two-Shadow Speculative Concurrency Control
Performance Evaluation of Two-Shadow Speculative Concurrency Control
Concurrency Control in Real-Time Database System: Optimistic Scheme vs. Two-Phase Locking
Concurrency Control in Real-Time Database System: Optimistic Scheme vs. Two-Phase Locking
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In Real-Time DataBase Management Systems (RTDBMSs), both the integrity constraints of the database and the temporal constraints of the transactions must be respected. In this paper, we focus on the real-time concurrency control protocol SCC which combines the advantages of both pessimistic and optimistic concurrency control methods. This protocol distinguishes two kinds of transaction conflicts: the write-write conflicts resolved by the TWR (Thomas Write Rule [1]) method and the read-write and write-read conflicts resolved by the transaction duplication. In this paper, we propose to extend this protocol in two ways: (1) the TWR method is, to our mind, not applicable in real time context and (2) we propose a new deadline-driven method combined with the transaction duplication. Thus, more transactions will meet their deadlines.