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Concurrency control in mobile distributed real-time database systems

JOURNAL OF PARALLEL AND distributed COMPUTING 2009年第10期69卷 866-876页

作者： Lei Xiangdong Zhao Yuelong Chen Songqiao Yuan Xiaoli Cent S Univ Sch Informat Sci & Engn Changsha 410083 Hunan Peoples R China

This paper presents DMVOCC-2PLV (distributed Multiversion Optimistic Concurrency Control with Two-Phase Local Validation) protocol for processing mobile distributed real-time transactions in mobile broadcast environments. In DMVOCC-2PLV protocol, transaction validation is performed at two levels: local validation and global validation. Local validation of transactions is performed in two phases: local pre-validation and local final validation. At the MHs (mobile Hosts), all mobile transactions perform local pre-validation of transactions by using a backward validation mechanism. The local pre-validation process is carried out against committed transactions at the server in the last broadcast cycle. Such an early data conflict detection feature can save processing and communication resources. Transactions that survive in local pre-validation must be submitted to the server for local final validation. In global validation distributed update transactions have to check to ensure distributed serializability in all participants. The protocol can eliminate conflicts between mobile read-only and mobile update transactions, and resolve data conflicts flexibly using multiversion dynamic adjustment of serialization order to avoid unnecessary restarts of transactions. mobile read-only transactions can be committed with no-blocking, and respond time of mobile read-only transactions is greatly reduced. The tolerance of mobile transactions of disconnections from the broadcast channel is increased. The results of simulation experiment show that the new protocol proposed offers better performance in terms of miss rate, restart rate, commit rate and throughput. (C) 2009 Elsevier Inc. All rights reserved.

关键词： mobile distributed real-time database systems Multiversion optimistic concurrency control Multiversion dynamic adjustment Pre-validation Multiversion data broadcast

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Scheduling transactions in mobile distributed real-time database systems

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Journal of Central South University of Technology 2008年第4期15卷 545-551页

作者：雷向东赵跃龙陈松乔袁晓莉 School of Information Science and Engineering Central South University

A DMVOCC-MVDA （distributed multiversion optimistic concurrency control with multiversion dynamic adjustment） protocol was presented to process mobile distributed real-time transaction in mobile broadcast environments. At the mobile hosts, all transactions perform local pre-validation. The local pre-validation process is carried out against the committed transactions at the server in the last broadcast cycle. Transactions that survive in local pre-validation must be submitted to the server for local final validation. The new protocol eliminates conflicts between mobile read-only and mobile update transactions, and resolves data conflicts flexibly by using multiversion dynamic adjustment of serialization order to avoid unnecessary restarts of transactions. mobile read-only transactions can be committed with no-blocking, and respond time of mobile read-only transactions is greatly shortened. The tolerance of mobile transactions of disconnections from the broadcast channel is increased. In global validation mobile distributed transactions have to do check to ensure distributed serializability in all participants. The simulation results show that the new concurrency control protocol proposed offers better performance than other protocols in terms of miss rate, restart rate, commit rate. Under high work load （think time is ls） the miss rate of DMVOCC-MVDA is only 14.6%, is significantly lower than that of other protocols. The restart rate of DMVOCC-MVDA is only 32.3%, showing that DMVOCC-MVDA can effectively reduce the restart rate of mobile transactions. And the commit rate of DMVOCC-MVDA is up to 61.2%, which is obviously higher than that of other protocols.

关键词： mobile distributed real-time database systems muliversion optimistic concurrency control multiversion dynamic adjustment pre-validation multiversion data broadcast

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distributed Multiversion Optimistic Concurrency Control for mobile real-time database systems

Distributed Multiversion Optimistic Concurrency Control for ...

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3rd International Conference on Wireless Communications, Networking and mobile Computing (WiCOM 2007)

作者： Lei Xiangdong Zhao Yuelong Chen Songqiao Yuan Xiaoli Cent S Univ Coll Informat Sci & Engn Changsha 410083 Hunan Peoples R China

ISBN: (纸本)9781424413119

In this paper DMVOCC-MDA-2PLV protocol is proposed for processing mobile distributed real-time transaction in mobile broadcast environments. The new protocol can eliminate conflicts between mobile read-only and mobile update transactions, and resolve data conflicts flexibly using multiversion dynamic adjustment of serialization order to avoid unnecessary restarts of transactions. mobile read-only transactions can be committed with no-blocking. Respond time of mobile read-only transactions is greatly improved. The tolerance of mobile transactions of disconnections from the broadcast channel is increased. The simulation results show that the new concurrency control protocol proposed offers better performance than other protocols.

关键词： mobile distributed real-time database systems muliversion optimistic concurrency control multiversion dynamic adjustment local pre-validation multiversion data broadcast

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