Results 341 to 350 of about 163,748 (368)

An algorithm modelling primary copy two-phase locking with integrated mechanism of timestamps

Proceedings of the 14th International Conference on Computer Systems and Technologies, 2013
The following paper presents a model of algorithm for primary copy two-phase locking (2PL). To avoid deadlocks of distributed transactions in distributed database management systems is used a timestamps mechanism. From the two strategies for timestamps mechanism for deadlocks avoiding, we consider the "wound -- wait" strategy. In the paper is presented
Lyubomir Gotcev, Svetlana Vasileva
openaire   +2 more sources

Multi-Wait Two-Phase Locking Mechanism and Its Hardware Implementation

1988
In database systems concurrency control mechanisms are essential to realize efficient systems. In this paper an efficient concurrency control mechanism called “Multi-Wait Two-Phase Locking Mechanism” is introduced. Although the mechanism realizes higher concurrency than conventional mechanisms, the mechanism itself is complicated.
Yahiko Kambayashi, K. Saisho
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A study of the behavior of the read: Write ratio under two-phase locking schemes

Information Systems, 1989
Abstract A number of synchronization techniques have been proposed for managing the concurrent execution of transactions. The performance study of these mechanisms has been done mainly with update transactions but the behavior of read-only transactions and the effect of read: write ratio have not been looked at in depth. Since the effect of read-only
openaire   +2 more sources

Bounds for Blocking and Deadlock in Transaction Systems with Two-Phase Locking

1993
The influence of data contention on the performance of database systems is increasing with the level of concurrency required for parallel processing. Besides simulation studies and measuring of a system, analytical models can help to estimate the effect of parameters and to optimize them in a multi-user environment.
openaire   +2 more sources

Performance evaluation of two-phase locking algorithms in a system for distributed databases

1983
In this paper the relationship between average transaction response time and the static degree of interference for four concurrency control algorithms based on two-phase locking is established. In particular the increase in average response time has been measured with respect to the static degree of interference for a given multiprogramming level ...
Thanos C, Carlesi C, Bertino E
openaire   +2 more sources

Emerging aqueous two-phase systems: from fundamentals of interfaces to biomedical applications

Chemical Society Reviews, 2020
Youchuang Chao, Ho Cheung Shum
exaly  

The effects of capillary forces on the axisymmetric propagation of two-phase, constant-flux gravity currents in porous media

Physics of Fluids, 2013
Herbert E Huppert, Jerome A Neufeld, Madeleine J Golding   +2 more
exaly  

Two-Phase Locking

2009
openaire   +1 more source

Multi-dimensional rheology-based two-phase model for sediment transport and applications to sheet flow and pipeline scour

Physics of Fluids, 2016
Ying Min Low, Cheng-hsien Lee, Yee-meng Chiew   +2 more
exaly  

A multicomponent real-fluid fully compressible four-equation model for two-phase flow with phase change

Physics of Fluids, 2019
Chaouki Habchi, Songzhi Yang
exaly