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检索条件"主题词=distributed databases"

共 10460 条记录，以下是171-180 订阅

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Integration of useful links in distributed databases using decision tree classification

Integration of useful links in distributed databases using d...

引用

International Conference on Information Systems and Economic Intelligence (SIIE)

作者： Tahar Mehenni Computer Science Department University Mohammed Boudiaf of M'sila M'sila Algeria

Nowadays, distributed relational databases constitute a large part of information storage handled by a variety of users. The knowledge extraction from these databases has been studied massively during this last decade. However, the problem still present in the distributed data mining process is the communication cost between the different parts of the database located naturally in remote sites. We present in this paper a decision tree classification approach with a low cost communication strategy using a set of the most useful inter-base links for the classification task. Different experiments conducted on real datasets showed a significant reduction in communication costs and an accuracy almost identical to some traditional approaches.

关键词： distributed databases Decision trees Data mining Relational databases Economics Predictive models

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An optimized strategy for replication in Peer-to-Peer distributed databases

An optimized strategy for replication in Peer-to-Peer Distri...

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IEEE International Conference on Computational Intelligence and Computing Research

作者： D. I. George Amalarethinam C. Balakrishnan Department of Computer Science Jamal Mohamed College Tiruchirappalli India Department of Computer Science Saint Joseph's College Tiruchirappalli India

ISBN: (纸本)9781467313421

Availability of data in distributed databases improves the QoS factors like, fault tolerance and response time. An efficient Replication management results in high degree of availability. The Replication of data among sites increases the success possibilities during the recovery. Replication is one part of the well known issue called Data Allocation Problem along with Allocation in the design phase of distributed databases. The Allocation improves accessibility of data. The Data Allocation Problem is a NP-Hard in its nature. Hence it requires an optimized solution for improved results. As a result of the current trends in research towards a better Allocation and Replication strategy with the usage of Optimization techniques, this paper proposes a methodology for replication of fragments in Peer-to-Peer environment with Hungarian Assignment Algorithm of optimization technique. The simulation results suggest that the population of successful queries is increased better than the initial and reallocation of fragments across the sites.

关键词： FlexiPeer Hungarian Assignment algorithm optimization technique Peer-to-Peer databases Reallocation Replication Replication allocation distributed databases design phases Fragments Database Nondeterministic polynomial-time hard data availability Fault tolerance

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Efficient Concurrency Control Mechanism for distributed databases

Efficient Concurrency Control Mechanism for Distributed Data...

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International Conference on Computing for Sustainable Global Development

作者： Parul Tomar Suruchi Department of Computer Engineering YMCA University of Science and Technology

ISBN: (纸本)9781467394178

distributed database is not a new term in the current world. A distributed database is a set of several databases that are correlated to each other in a logical fashion over the network. Data is distributed as well as replicated at various locations in order to increase the availability. During recent years, data distribution has been evaluated as an important issue for databases. Since the data is distributed, it becomes necessary that all the copies be synchronized at the time of any data update, thus leaving all the copies with consistent data. This research paper will present a consistent concurrency algorithm which presents a solution to consistency problem of distributed databases.

关键词： Concurrency control Database distributed databases Timestamp Transaction Voting

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CBIR in distributed databases using a Multi-Agent System

CBIR in Distributed Databases using a Multi-Agent System

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IEEE International Conference on Image Processing

作者： David Picard Matthieu Cord Arnaud Revel ETIS ENSEA/UCP/CNRS Cergy-Pontoise France

Information retrieval techniques have to face both the growing amount of data to be processed and the "natural"' distribution of these data over the network. Hence, we introduce in this paper a new architecture for image retrieval in distributed image databases, based on multi-agent, systems. Our system, inspired by "ant-agents", uses labels provided by the user for learning both the searched category of images and die path to the most relevant databases. We then show how effective can be our architecture on a generalist image database network.

关键词： distributed databases Multiagent systems Image databases Information retrieval Image retrieval Tin Image color analysis Visual databases Computer networks Indexes

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Privacy in horizontally distributed databases based on association rules

Privacy in horizontally distributed databases based on assoc...

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International Conference on Circuit, Power and Computing Technologies (ICCPCT)

作者： M Santhana Joyce V Nirmalrani Sathyabama University Chennai Tamil Nadu IN Department of IT Sathyabama University Chennai Tamilnadu India

databases are used among various areas for storage of large data items. Viewing data from this large dataset became a difficult task. Hence, data mining was introduced to retrieve and view the necessary data. Data mining is a process of extracting the large databases, these databases are mostly scattered among various websites where security is required. These databases are divided into various categories such as horizontally distributed databases, vertically distributed databases and hybrid distributed databases. When this data size increases, there exists data leakage, less security, etc. The distributed databases are shared among various servers where insecurity occurs. To secure databases when sharing data in a database various methodologies were being used. Earlier there exists a trusted third party who performs various cryptographic primitives and the trusted third party acts as an intermediate between the sites in which the probability of data leakage increases. Hence, this paper proposes a new protocol to reduce the data leakage and to improve the security of the horizontally distributed databases. The outcome of the proposed architecture provides methods where no trusted third party is required, the sites themselves communicate each other for a secure mining as well as enhanced security. This proposed architecture covers almost all the disadvantages occurred in the previous algorithms and has been implemented in the synthetic employment office database.

关键词： distributed databases Association rules Protocols Cryptography Data privacy

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An adaptive object management algorithm for distributed databases in mobile computing environments

An adaptive object management algorithm for distributed data...

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International Conference on Information, Communications and Signal Processing

作者： Lin Wujuan B. Veeravalli Department of Electrical and Computer Engineering National University of Singapore Singapore

In this paper, we address the problem of servicing requests that arrive at a distributed database system(DDBS) in a mobile computing environment(MCE). In a MCE, mobile users may interact with a database system in retrieving objects. Transactions on objects can read or write requests from mobile users in a random manner. In this paper, from theoretical standpoint, we design and evaluate a practically realizable object allocation and replication algorithm, referred to as adaptive distributed request window (ADRW) algorithm, that adapts to the changing patterns of on-line requests. Our objective is to dynamically adjust the allocation schemes of objects so as to minimize the total servicing cost of all the requests that arrive at a DDBS. Finally, we use competitive analysis to quantify the performance of our ADRW algorithm.

关键词： Environmental management distributed databases Mobile computing distributed computing Transaction databases Algorithm design and analysis Database systems Information retrieval Costs Performance analysis

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Object allocation in distributed databases and mobile computers

Object allocation in distributed databases and mobile comput...

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International Conference on Data Engineering

作者： Yixiu Huang O. Wolfson Electrical Engineering and Computer Science Department University of Illinois Chicago IL USA

ISBN: (纸本)0818654023

This paper makes two contributions. First, we introduce a model for evaluating the performance of data allocation and replication algorithms in distributed databases. The model is comprehensive in the sense that it accounts for I/O cost, for communication cost, and for limits on the minimum number of copies of the object (to ensure availability). The second contribution of this paper is the introduction and analysis of an algorithm for automatic dynamic allocation of replicas to processors. Using the new model, we compare the performance of the traditional read-one-write-all static allocation algorithm, to the performance of the dynamic allocation algorithm. As a result, we obtain the relationship between the communication cost and I/O cost for which static allocation is superior to dynamic allocation, and the relationships for which dynamic allocation is superior.< >

关键词： distributed databases Mobile computing distributed computing Mobile communication Cost function Communication system control Availability Delay Algorithm design and analysis Electronic publishing

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Middleware to Integrate Patient Data from Heterogeneous distributed databases and Its Efficacy

Middleware to Integrate Patient Data from Heterogeneous Dist...

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International Conference on Computational Science and Computational Intelligence (CSCI)

作者： Subrata Kumar Das Mohammad Zahidur Rahman Dept. of Computer Science and Engineering Jahangirnagar University Dhaka Bangladesh

ISBN: (纸本)9781665458429

The health organizations store the patient data in different repositories and scattered in diverse locations. In the healthcare domain, the problem is that each hospital or even each department under a hospital maintains its own database having various data models (SQL, NoSQL, etc.). In this situation, existing or new applications require to grant healthcare actors to locate and share patient data from those pre-existing distributed databases (DDBs) remotely for the needs of patient quality treatment, daily operations of the health centers. However, data integration from distributed data sources is raising concern for data model variability. Therefore, it is significant to identify that how much an application like middleware is efficient to reconstruct and share patient data remotely from heterogeneous DDBs over the networks. The health organizations could also require to ensure whether their existing database model performs well or should replace by another one. So, this paper aims to design a system using different databases consisting of distinct data structures and an algorithm for middleware to integrate data from them with testing the system performance. The experimental results of this research work show that the patient data could be shared from various distributed data sources efficiently. Therefore the study could direct the healthcare organizations for sharing patient data from heterogeneous distributed databases without replacing the existing data model.

关键词： Hospitals Soft sensors Computational modeling distributed databases Organizations Data structures Data models

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Concurrency control and data replication strategies for large-scale and wide-distributed databases

Concurrency control and data replication strategies for larg...

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International Conference on Database Systems for Advanced Applications

作者： J. Tao J.G. Williams Department of Information Science and Telecom University of Pittsburgh Pittsburgh PA USA

ISBN: (纸本)0769509967

The explosion of the Internet and the advances in high-speed wide-area networks (WANs) provide the opportunity to distribute large database systems over geographically distant sites to improve the performance and the robustness of such systems. The traditional concurrency control and commitment control protocols should be re-designed to fit this new scenario. Because of the diversity of applications, it is possible that the correctness of a transaction and database consistency can be relaxed based on the requirements of the application. This paper focuses on developing revised protocols to provide different levels of consistency and performance to meet the different needs of various applications in large and widely distributed database systems. In our approach, the entire system is organized in a tree framework. The concepts of insular consistency and regional consistency are introduced to relax strict consistency from the time and space dimensions. A concurrency control protocol, called the Hierarchical Token Forwarding Protocol (HTFP), and a commitment control protocol, called the Hierarchical Asynchronized Multi-level-consistency Protocol (HAMP), are proposed to achieve different kinds of consistency in a single distributed database system.

关键词： Concurrency control Large-scale systems Wide area networks Protocols Delay Concurrent computing distributed databases Local area networks Database systems Transaction databases

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Agent based dynamic recovery protocol in distributed databases

Agent based dynamic recovery protocol in distributed databas...

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International Symposium on Parallel and distributed Computing

作者： Yu Wang Xinsong Liu Research Laboratory University of Electronic Science and Technology Chengdu China

ISBN: (纸本)0769520693

Recovering from node failures is a critical issue in distributed database systems. In conventional log-based recovery protocols, the nodes providing recovery service may be overburdened, especially when the recovery is resource consuming. In this paper, an agent-based dynamic recovery protocol is presented. It divides the whole recovery process into three major steps: log-recovery, agent-recovery, and synchronization. The key idea of this protocol is to cache new database operations initiated during recovery into agents. All these cached operations are then replayed independently for further recovery. The analysis indicates that the new protocol can minimize internode's dependency and improve recovery speed As a result, system failure rate is cut down and the overall performance gets improved.

关键词： Protocols distributed databases Database systems Checkpointing Image restoration Computer crashes Delay Fault tolerance System performance distributed computing

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