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检索条件"主题词=distributed database"

共 514 条记录，以下是51-60 订阅

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Research on Query Optimization Technology in distributed database

Research on Query Optimization Technology in Distributed Dat...

引用

International Conference on Materials Science and Information Technology (MSIT 2011)

作者： Wu Bozhu Chongqing Ind Polytech Coll Chongqing Peoples R China

ISBN: (纸本)9783037853191

Through the in-depth study of the existing distributed database query processing technology, this paper proposes a distributed database query processing program. This program optimizes the existing query processing, stores the commonly used query results according to the query frequency, to be directly used by the subsequent queries or used as intermediate query results, thus avoiding possible transmission of a large number of data, thereby reducing the query time and improving query efficiency.

关键词： distributed database query optimization data dictionary

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A Tree-based Genetic Algorithm for distributed database

A Tree-based Genetic Algorithm for Distributed Database

引用

IEEE International Conference on Automation and Logistics

作者： Li, Hongxing Luo, Bingzhang Beijing Union Univ Automat Coll Beijing 100101 Peoples R China Shanghai Pudong Int Airport Co Ltd AOC Dept Shanghai 201202 Peoples R China

ISBN: (纸本)9781424425020

The successful application of genetic algorithms in distributed database greatly depends on appropriate coding method for query optimization because the coding method of parameters can directly affect the construction of genetic operators and performance of the algorithms. Considering a combinatorial optimum with the restriction of both the position and the condition to include a lot of messages, this paper aims to devise a new coding method with tree structure based on the position and the value. Besides, the genetic operators, i.e. reproduction, crossover and mutation are designed for this coding. The improved crossover needs to be implemented by two steps and the improved mutation is composed of the value mutation and the position mutation. The proposed algorithm is used to implement query of distributed database, the experiment results showed that it is very effective for optimization.

关键词： genetic algorithm coding method genetic operators distributed database

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Security and Efficient Data Verification Protocol for distributed database based on Zero-knowledge Proof 27

Security and Efficient Data Verification Protocol for Distri...

引用

27th International Conference on Computer Supported Cooperative Work in Design (CSCWD)

作者： Liu, Han Bai, YunXu Cent South Univ Sch Mech & Elect Engn Changsha Peoples R China

ISBN: (纸本)9798350349184;9798350349191

Recently, distributed databases have achieved tremendous realistic performances and developed one of the most essentially utilized tools in society communication applications. However, the existing distributed databases often contain users' sensitive information and are vulnerable to web attackers, which may cause severe privacy issues and economic loss. In this paper, we first attempt to propose a novel protocol to dispose of the potential verification risks in distributed databases. Compared with currently distributed databases, the requester can steal important data without any payment. Therefore, our model faces two primary challenges including guaranteeing the efficiency and security of the distributed databases, the data verification procedure may lead to data leakage. To address the above problems, we utilize zero-knowledge proof to dispose of the data verification issue for the requester. Moreover, a secure and effective proof protocol is established to achieve database responses the privacy data access. From our extensive experimental results, we can conclude that our developed framework can achieve an effective performance with reasonable communication costs.

关键词： distributed database Data Verification Security Zero-knowledge Proof

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Fuzzy c-Lines for Vertically distributed database with Missing Values 12

Fuzzy c-Lines for Vertically Distributed Database with Missi...

引用

Joint 12th International Conference on Soft Computing and Intelligent Systems / 23rd International Symposium on Advanced Intelligent Systems (SCIS and ISIS)

作者： Kunisawa, Kohei Honda, Katsuhiro Ubukata, Seiki Notsu, Akira Osaka Prefecture Univ Grad Sch Engn Sakai Osaka 5998531 Japan Osaka Metropolitan Univ Grad Sch Informat Sakai Osaka 5998531 Japan Osaka Metropolitan Univ Grad Sch Sustainable Syst Sci Sakai Osaka 5998531 Japan

ISBN: (纸本)9781665499248

Privacy preserving data clustering is a useful method for extracting intrinsic cluster structures from distributed databases keeping personal privacy. In a previous research, a model of performing Fuzzy c-Lines clustering was proposed, where a privacy preserving scheme of k-means-type model was adopted with cryptographic calculation. This paper further improves the model for handling incomplete data ignoring the influences of missing values. The element-wise clustering criterion enables to derive local principal component vectors in each data sources by considering minimization of low-rank approximation of observed elements only. Then, fuzzy memberships of each object are calculated in a collaborative manner among organizations, where partial distances between objects and prototypes are derived with cryptographic framework so that intra-organization information is kept secret. The characteristic features of the proposed method are demonstrated through numerical experiments.

关键词： Fuzzy clustering Linear clustering distributed database

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Lock Violation for Fault-tolerant distributed database System 37

Lock Violation for Fault-tolerant Distributed Database Syste...

引用

37th IEEE International Conference on Data Engineering (IEEE ICDE)

作者： Guo, Hua Zhou, Xuan Cai, Le Renmin Univ China Sch Informat Beijing Peoples R China East China Normal Univ Shanghai Engn Res Ctr Big Data Management Shanghai Peoples R China Alibaba Grp San Mateo CA USA

ISBN: (纸本)9781728191843

Modern distributed database systems scale horizontally by partitioning their data across a large number of nodes. Most such systems build their transactional layers on a replication layer, employing a consensus protocol to ensure data consistency to achieve fault tolerance. Synchronization among replicated state machines thus becomes a significant overhead of transaction processing. Without careful design, synchronization could amplify transactions' lock duration and impair the system's scalability. Speculative techniques, such as Controlled Lock Violation (CLV) and Early Lock Release (ELR), prove useful in shortening lock's critical path and boosting transaction processing performance. To use these techniques to optimize geo-replicated distributed databases(GDDB) is an intuitive idea. This paper shows that a naive application of speculation is often unhelpful in a distributed environment. Instead, we introduce distributed Lock Violation (DLV), a specialized speculative technique for geo-replicated distributed databases. DLV can achieve good performance without incurring severe side effects.

关键词： distributed database Transaction Locking High Availability

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Multilevel Policy Based Security in distributed database 1

引用

1st International Conference on Advances in Computing and Communications

作者： Batra, Neera Singh, Manpreet Department of Computer Engineering M. M. Engineering College M. M. University Mullana

ISBN: (数字)9783642227097

ISBN: (纸本)9783642227080

Addressing security demands under fixed budgets and tight time constraints are becoming extremely challenging, time consuming and resource intensive. Moreover, securing the distributed database in compliance with several security guidelines makes the system more complex. Mission critical systems, military, government and financial institutions have been under tremendous pressure to secure their databases. Such requirements mandate that each system passes a strict security scan before it is deemed suitable to go into operational mode. This paper presents a framework that embeds security capabilities into distributed database by replicating different predefined security policies at different sites using multilevel secure database management system.

关键词： Policy based security Replication Multilevel secure database Covert channel distributed database

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Cassandra-A distributed database System: An Overview

Cassandra-A Distributed Database System: An Overview

引用

Springer International Conference on Emerging Technologies in Data Mining and Information Security (IEMIS)

作者： Wahid, Abdul Kashyap, Kanupriya Natl Inst Technol Patna Dept Comp Sci & Engn Patna 800005 Bihar India Natl Inst Technol Kurukshetra Dept Comp Engn Kurukshetra 136119 Haryana India

ISBN: (纸本)9789811319518;9789811319501

In big data environment, apache Cassandra is a distributed database which offers very high availability. It is an open source database system and is designed to manage large transactional data across various server globally. Main feature of Cassandra is to provide high availability and very high fault tolerance, decentralized database system with zero downtime. A traditional relational database (RDBMSs) is used to storing data for various applications from many years, but some changes are required because application must be scale to levels that were unimaginable. But only scaling is not the main concern of changes, companies are also requires such type of applications that always available and running fast where RDBMS database fail. Apache Cassandra is a fully distributed database that has such type of architecture where it handles extreme data velocity with highly availability, scalability and recovers from fault tolerance easily. In Cassandra architecture, there is no master node to handle all the nodes in the ring or network. The data distribution among nodes in this architecture is in equal probation. Cassandra creates such type of environment where an entire datacenter can lose but still perform as if nothing happened. This paper provides a brief idea about Cassandra.

关键词： distributed database Cassandra Decentralized Fault tolerant

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Fast algorithm for mining global frequent itemsets based on distributed database

Fast algorithm for mining global frequent itemsets based on ...

引用

1st International Conference on Rough Sets and Knowledge Technology (RSKT 2006)

作者： He, Bo Wang, Yue Yang, Wu Chen, Yuan ChongQing Inst Technol Sch Comp Sci & Engn Chongqing 400050 Peoples R China

ISBN: (纸本)3540362975

There were some traditional algorithms for mining global frequent itemsets. Most of them adopted Apriori-like algorithm frameworks. This resulted a lot of candidate itemsets, frequent database scans and heavy communication traffic. To solve these problems, this paper proposes a fast algorithm for mining global frequent itemsets, namely the FMGFI algorithm. It can easily get the global frequency for any itemsets from the local FP-tree and require far less communication traffic by the searching strategies of top-down and bottom-up. It effectively reduces existing problems of most algorithms for mining global frequent itemsets. Theoretical analysis and experimental results suggest that the FMGFI algorithm is fast and effective.

关键词： global frequent itemsets distributed database FP-tree FP-growth

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ACTDP: An Adaptive Chunk Tool for database Partition in Shared-nothing distributed database 9

ACTDP: An Adaptive Chunk Tool for Database Partition in Shar...

引用

9th IEEE International Conference on Software Engineering and Service Science (ICSESS)

作者： Huang, Xiaoming Shen, Zhen Shanghai Jiao Tong Univ Dept Software Engn 800 Dongchuan Rd Shanghai Peoples R China

ISBN: (纸本)9781538665657

Shared-nothing, distributed database is the core component for modern OLTP application. It uses horizontal partlnonlng to partition data into multiple partlttens to achieves both ACID and scalability. The existing distributed transactions degrade the performance of database, many parntion management systems therefore had been proposed to use graph partmoning to mitigate impact of distributed transactions on performance, These systems run well when amount of data is limited, but consume a lot of resources otherwise, This paper proposed an adaptive chunk tool ACTDP, automatically aggregate the vertices in the graph in such systems by consider both number and weight of each vertex, improves performance of these graph-based partltton management systems.

关键词： OLTp Sb area-nothing distributed database distributed Transaction Graph Partitioning Chunk

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A distributed database view of network tracking systems

A distributed database view of network tracking systems

引用

20th Conference on Signal and Data Processing of Small Targets

作者： Yosinski, Jason Paffenroth, Randy Numerica Corp Loveland CO 80538 USA

ISBN: (纸本)9780819471604

In distributed tracking systems, multiple non-collocated trackers cooperate to fuse local sensor data into a global track picture. Generating this global track picture at a central location is fairly straightforward, but the single point of failure and excessive bandwidth requirements introduced by centralized processing motivate the development of decentralized methods. In many decentralized tracking systems, trackers communicate with their peers via a lossy, bandwidth-limited network in which dropped, delayed, and out of order packets are typical. Oftentimes the decentralized tracking problem is viewed as a local tracking problem with a networking twist;we believe this view can underestimate the network complexities to be overcome. Indeed, a subsequent 'oversight' layer is often introduced to detect and handle track inconsistencies arising from a lack of robustness to network conditions. We instead pose the decentralized tracking problem as a, distributed database problem, enabling us to draw inspiration from the vast extant literature on distributed databases. Using the two-phase commit algorithm, a well known technique for resolving transactions across a lossy network, we describe several ways in which one may build a distributed multiple hypothesis tracking system from the ground up to be robust to typical network intricacies. We pay particular attention to the dissimilar challenges presented by network track initiation vs. maintenance and suggest a hybrid system that balances speed and robustness by utilizing two-phase commit for only track initiation transactions. Finally, we present simulation results contrasting the performance of such a system with that of more traditional decentralized tracking implementations.

关键词： distributed target tracking distributed database two-phase commit initiation SIAP

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