1,721,169 research outputs found
Russie - Filarmonica della Scala Myung-Whun Chung direttore Alexander Romanovsky pianoforte
No full textFilarmonica della Scala Myung-Whun Chung direttore Alexander Romanovsky pianofort
Russie - Filarmonica della Scala Myung-Whun Chung direttore Alexander Romanovsky pianoforte
No full textFilarmonica della Scala Myung-Whun Chung direttore Alexander Romanovsky pianofort
Wonderworld humanity and Alexander Romanovsky humanity (60 anniversary of the birth)
Full text linkУ статті розкрито дивосвіт людскості й людяності Олександра Романовського.In the article dreamland lyudskosti Alexander Romanovsky and humanity
Proceedings of the 2007 Workshop on Engineering Fault Tolerant Systems, EFTS 2007, Dubrovnik, Croatia, September 4, 2007
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Proceedings of the 2008 RISE/EFTS Joint International Workshop on Software Engineering for Resilient Systems, Newcastle Upon Tyne — November 17 - 19, 2008
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Formal Development of a Total Order Broadcast for Distributed Transactions using Event-B
No full textAbstract. In a replicated database system, copies of the database are kept across several sites for fault-tolerance and availability. Data access in such systems is usually done within a transactional framework. A read-only transaction accesses data locally and an update transaction modifies the database at all sites. Total order broadcast primitives have been proposed to support transactions and allow fault-tolerant cooperation between the sites in a distributed system. In this paper, we identify and analyze the problem of formation of deadlocks among conflicting update transactions due to race conditions and outline how a system of total order broadcast prevents deadlocks and transaction failures. Later we outline how a refinement based approach with Event-B can be used for formal development of the models of total order broadcast. In this approach we begin with the abstract model of a total order broadcast and verify that the required ordering properties are preserved by the system. total order can correctly be implemented by using a notion of sequence number. This technique requires us to discharge proof obligations due to consistency and refinement checking. To discharge the proof obligations we are required to discover invariants that describes the relationship between the abstract total order and the underlying mechanism.
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