Applying formal methods to semantic-based decomposition of transactions
ACM Transactions on Database Systems (TODS)
Revisiting Transaction Management in Multidatabase Systems
Distributed and Parallel Databases
Real-time update of access control policies
Data & Knowledge Engineering
Applying Semantic Knowledge to Real-Time Update of Access Control Policies
IEEE Transactions on Knowledge and Data Engineering
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Abstract: Serializability is the traditionally accepted notion of correctness in most database systems. However, in a multidatabase system (MDBS) environment, where a number of pre-existing and autonomous database systems are integrated, requiring serializability could adversely affect the performance of the system. To enhance performance, one of the options is to relax the serializability requirement, and permit certain non-serializable executions. In this paper, we propose a powerful, yet simple mechanism, for specifying the set of non-serializable executions that are unacceptable in an MDBS environment. The undesirable interleavings among transactions are specified using regular expressions over transaction types. The mechanism facilitates the development of efficient graph-based schemes for ensuring that the concurrent execution of transactions meet the specifications. We analyze the complexities of the developed schemes and show that they are easily implementable in an MDBS environment.