检索结果-内蒙古大学图书馆

作者： Takahiro Hara Kaname Harumoto Masahiko Tsukamoto Shojiro Nishio Department of Information Systems Engineering Graduate School of Engineering Osaka University Osaka Japan 565

Since in broadband networks the whole contents of a database can be transferred from one site to another in a short period, database migration is expected to be one of the most powerful database operations in future distributed database systems. In an environment with database migration, it is necessary to develop a method to manage the location of each database so as to allow accessing of migrating databases. In this paper, we first propose several database location management methods, some of which make use of the features of ATM (Asynchronous Transfer Mode) networks. Then, we compare the performance of these methods by simulation study for various system parameters, such as the frequency of queries and of database migration, and the scale of the network. The results are used to identify the optimal location management method for a given system environment. © 1997 Scripta Technica, Inc. Syst Comp Jpn, 28(9): 35–45, 1997

关键词： database migration location management ATM (Asynchronous Transfer Mode) distributed database

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A hierarchical commitment algorithm for permanent time stamp ordering

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Systems and Computers in Japan 2000年第12期31卷

作者： Shin-ya Kobayashi Kouji Matsuura Nobuyuki Ishimori Munehiro Fukuda Faculty of Engineering Kanazawa University Kanazawa Japan 920-8667 Institute of Information Sciences and Electronics University of Tsukuba Tsukuba Japan 305-8576

One of the concurrent execution control schemes in distributed database systems is the permanent time stamp method, in which the order of the requests can be followed. The method provides two phases of commitment control: precommitment and true commitment. In the acknowledgment of true commitment, the global processing minimum time stamp (GTA), which is the minimum value of the time stamps for the processing transactions in the system, is used. Methods proposed for the determination of the GTA include a method based on circulating tokens [1] and the method in which the decision is made centrally in the control node [2]. This paper proposes a method in which the nodes are logically connected in a tree structure, and the GTA is determined by the root node, to which the local minimum values of the time stamps for the transactions being processed are sent from each node. It is shown that the root node can determine the correct GTA by the proposed method and that the GTA is always increasing. © 2000 Scripta Technica, Syst Comp Jpn, 31(12): 83–92, 2000

关键词： distributed database concurrent execution control permanent time stamp method proof of validity

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A dynamic replica allocation method based on database migration in broadband networks

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Systems and Computers in Japan 2000年第8期31卷

作者： Takahiro Hara Kaname Harumoto Masahiko Tsukamoto Shojiro Nishio Jun Okui Department of Information Systems Engineering Graduate School of Engineering Osaka University Suita Japan 565-0871 Department of Electronic Systems and Information Engineering Faculty of Biology-Oriented Science and Technology Kinki University Wakayama Japan 649-6493

Dynamic relocation of databases through networks, or database migration, will soon become a powerful standard database operation effectively using recent advances in broadband networks. In our previous work, a transaction processing method has been proposed in distributed database environments, based on database migration operations. Generally, database replication is an effective technique to improve transaction processing throughput in conventional systems. In this paper, we propose a replica management method for use with database migration. database migration is used at the beginning of a transaction to dynamically relocate database replicas. The performance of the proposed method is evaluated using simulation results. © 2000 Scripta Technica, Syst Comp Jpn, 31(8): 22–32, 2000

关键词： database migration database replication broadband network distributed database

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