Results 71 to 80 of about 239,255 (120)
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Multiversion cautious schedulers for database concurrency control
IEEE Transactions on Software Engineering, 1990Let MC stand for a class of logs (i.e. sequences of read/write steps of transactions) that are serializable when multiple versions of the data items are maintained. The multiversion cautious scheduler, MCS(MC) which is introduced, outputs a sequence belonging to MC by reordering, if necessary, the incoming sequence of requests from transactions and it ...
Tiko Kameda +2 more
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Starvation-free secure multiversion concurrency control
Information Processing Letters, 1998Concurrency control is important for multilevel secure databases because a covert channel can be easily created through collaboration of multilevel transactions in most traditional concurrency control mechanisms. We, in this paper, propose a secure multiversion concurrency control mechanism.
Kim, HT, Kim, MH Kim, Myoung Ho
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Concurrency control and recovery for multiversion database structures
Proceedings of the 2nd PhD workshop on Information and knowledge management, 2008In modern database applications access to historical versions of the dataset is becoming increasingly important. Several multiversion structures with corresponding concurrency-control and recovery algorithms exist, but none of these have optimal logarithmic execution times for all actions in all situations. The time-split B+tree by Lomet et al.
Seppo Sippu +3 more
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A transaction model and multiversion concurrency control for mobile database systems [PDF]
Distributed and Parallel Databases, 2007 Transaction management on Mobile Database Systems (MDS) has to cope with a number of constraints such as limited bandwidth, low processing power, unreliable communication, and mobility etc. As a result of these constraints, traditional concurrency control mechanisms are unable to manage transactional activities to maintain availability.
Sourav S. Bhowmick +3 more
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On-line multiversion database concurrency control
Acta Informatica, 1992This paper presents a new model for studying the concurrency vs. computation time tradeoffs involved in on-line multiversion database concur- rency control. The basic problem that is studied in our model is the following: Given: a current database system state which includes information such as which transaction previously read a version from which ...
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IEEE Transactions on Knowledge and Data Engineering, 1993
A version control mechanism is proposed that enhances the modularity and extensibility of multiversion concurrency control algorithms. The multiversion algorithms are decoupled into two components: version control and concurrency control. This permits modular development of multiversion protocols and simplifies the task of proving the correctness of ...
Divyakant Agrawal, Soumitra Sengupta
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A version control mechanism is proposed that enhances the modularity and extensibility of multiversion concurrency control algorithms. The multiversion algorithms are decoupled into two components: version control and concurrency control. This permits modular development of multiversion protocols and simplifies the task of proving the correctness of ...
Divyakant Agrawal, Soumitra Sengupta
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Multiversion Concurrency Control for Multidimensional Index Structures
2007Prevailing concurrency control mechanisms for multidimensional index structures, such as the Generalized Search Tree (GiST), are based on locking techniques. These approaches may cause significant overhead in settings where the indexed data is rarely updated and read access is highly concurrent.
Ion Constantinescu +3 more
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A MULTIVERSION OPTIMISTIC CONCURRENCY CONTROL PROTOCOL IN MOBILE BROADCAST ENVIRONMENTS
International Journal of Computers and Applications, 2010AbstractThis paper presents MVOCC-MDA-2PV (multiversion optimistic concurrency control with multiversion dynamic adjustment using two-phase validation) protocol for processing mobile real-time transaction in mobile broadcast environments. Transaction validation is performed at two phases: pre-validation and final validation.
Y. Xiaoli +3 more
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Effective optimistic concurrency control in multiversion object bases
1994The use of versioned data has proven its value in many areas of Computer Science including concurrency control. In this paper we examine the use of versioned objects in object bases for the purpose of enhancing concurrency. We provide a framework for discussing multi-version objects which includes fundamental definitions, the abstraction of objects as ...
Ken Barker, Peter Graham
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Concurrency control for a mix of universioned and multiversioned entities in distributed databases
Journal of Parallel and Distributed Computing, 1990Abstract In this paper, we present a concurrency control protocol applicable to distributed databases with any mix of universioned and multiversioned entities. The protocol has performance merits at high workloads at which even pessimistic protocols do not perform well. These merits exist at the expense of poorer performance at lower workloads.
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