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检索条件"主题词=distributed databases"

共 10439 条记录，以下是141-150 订阅

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A timestamp-based concurrency control algorithm for heterogeneous distributed databases

A timestamp-based concurrency control algorithm for heteroge...

引用

International Conference on Computing and Information (ICCI)

作者： S.M. Chung K.A. Elghayesh Department of Computer Science and Engineering Wright State University Dayton OH USA

A heterogeneous distributed database system (HDDS) integrates existing database systems to support global transactions which access multiple databases, where local database systems may use different concurrency control mechanisms. This heterogeneity together with the requirement of preserving the autonomy of the local databases makes the problem of ensuring the serializability of global transactions more difficult compared to the distributed database systems. This paper proposes a concurrency control algorithm based on the timestamp ordering. The proposed algorithm guarantees the serializability of transactions without a deadlock, and preserves the autonomy of the local database systems.< >

关键词： Concurrency control distributed databases Transaction databases Database systems Computer science Data engineering System recovery

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Schema integration of distributed databases using hyper-graph data model

Schema integration of distributed databases using hyper-grap...

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IEEE International Conference on Information Reuse and Integration (IRI)

作者： Srikrishnan Sundaresan G. Hu Department of Computer Science Central Michigan University Mount Pleasant MI USA

To efficiently retrieve information from heterogeneous and distributed data sources has become one of the top priorities for institutions across the business world. Information from these sources needs to be integrated into one single system such that the user can retrieve the desired information through the integrated system by a single query. In this paper, we present a design and a prototype implementation of a system for schema integration of distributed databases. The method we developed is based on the hyper-graph data model (HDM). The integration process is accomplished using the HDM operations. User's queries are submitted to the integrated schema but executed on local databases via the mapping structure that is established in the schema integration phase.

关键词： distributed databases Data models Information retrieval Database systems Data structures Computer science Prototypes Warehousing System testing

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Parallel reduction of a chain query in distributed databases

Parallel reduction of a chain query in distributed databases

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International Conference on Computing and Information (ICCI)

作者： Yanchun Zhang M.E. Orlowska Centre of Expertise in Distributed Information Systems Department of Computer Science University of Queensland Australia

This paper extends the results of P.A. Bernstein and D.W. Chiu (1981), P.A. Bernstein and N. Goodman (1981), and J.D. Ullman (1988), by constructing a parallel algorithm for a subset of tree queries called chain queries. An efficient parallel algorithm for a construction of full reducers for chain queries is presented and analyzed. The authors claim that the full reduction of a chain query can be done in parallel by executing only 2n-2 semijoins in the time required for an n-1 semijoins evaluation.< >

关键词： distributed databases Relational databases Parallel algorithms Tree graphs distributed information systems Computer science Australia Algorithm design and analysis Query processing Computational efficiency

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A set of tools for building postgreSQL distributed databases in biomedical environment

A set of tools for building postgreSQL distributed databases...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： M. Cavalleri R. Prudentino U. Pozzoli G. Reni I. R. C. C. S. E. Medea Bosisio Parini Italy

ISBN: (纸本)0780364651

PostgreSQL is an advanced Object-Relational DBMS supporting SQL constructs and accessible with standard protocols. Its object-oriented features qualify it for managing biomedical data and it is freely available to the community via the open-source philosophy. Unfortunately the current available version does not support any database distribution feature. The aim of the present work was to develop specific procedures In order to extend original potentials of PostgreSQL ORDBMS and make it able to manage distributed databases by means of asynchronous replication. Particular attention was devoted to conflict resolution rules, including several procedures with different degrees of restrictiveness and even giving the end user the possibility to write user-defined conflict resolution procedures. The replication system was tested at the IRCCS "E, Medea", an Italian Scientific and clinical research Institute spread over 5 sites In different geographical locations. The testing system was developed with the purpose to make clinical data collected by Epileptology Units in each site available to all branches, without having to care for their physical distribution. The proposed replica procedures manage only traditional (non-binary) data types because of the very different storage model of large objects. Since large objects are very common for treatment and storage of biomedical data, the authors are currently working on an improved version of the replica engine that allows large objects to be replicated.

关键词： distributed databases Spatial databases Object oriented databases Bioinformatics System testing Buildings Access protocols Open source software Epilepsy Object oriented modeling

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Implementation issues of host DBMS simulator supporting the test for distributed databases in switching software

Implementation issues of host DBMS simulator supporting the ...

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International Conference on Information Networking

作者： Young-Ho Park Yong-Ik Yoon Wan Choi Database Team Real time OS Section Electronics and Telecommunications Research Institute Daejeon South Korea Department of Computer Science SookMyung Women's University Seoul South Korea

ISBN: (纸本)0818672250

This shows a host DBMS simulator that can simulate directly switching software having Embedded SQL on a host computer, not switching systems. Execution files compiled on a host are loaded on the switching system, after testing on the switching testbed hardware. The testing on the testbed has difficult problems that cannot share more than one user simultaneously and can not test the relationship between two execution files. To solve the restriction, the host DBMS simulator has been developed. This is a simulator that can test execution files on the host without loading to the testbeds or switching systems, and can control simultaneously many query requests generated by multiple users on the same host. In this paper, we propose a DBMS simulator on the host system, and present in detail implementation methods of the simulator.

关键词： distributed databases System testing Software testing Switching systems Computational modeling Telecommunication switching Hardware Computer simulation Real time systems Software packages

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Deferred updates and data placement in distributed databases

Deferred updates and data placement in distributed databases

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International Conference on Data Engineering

作者： P. Chundi D.J. Rosenkrantz S.S. Ravi Department of Computer Science State University of New York Albany Albany NY USA

Commercial distributed database systems generally support an optional protocol that provides loose consistency of replicas, allowing replicas to be inconsistent for some time. In such a protocol, each replicated data item is assigned a primary copy site. Typically, a transaction updates only the primary copies of data items, with updates to other copies deferred until after the transaction commits. After a transaction commits, its updates to primary copies are sent transactionally to the other sites containing secondary copies. We investigate the transaction model underlying the above protocol. We show that global serializability in such a system is a property of the placement of primary and secondary copies of replicated data items. We present a polynomial time algorithm to assign primary sites to data items so that the resulting topology ensures serializability.

关键词： distributed databases Database systems Transaction databases Computer science Polynomials Topology Availability Concurrency control Access protocols Message-oriented middleware

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An environment for prototyping real-time distributed databases

An environment for prototyping real-time distributed databas...

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International Conference on Systems Integration

作者： S.H. Son Department of Computer Science University of Virginia Charlottesville VA USA

A prototyping environment for investigating distributed real-time database systems is described. The prototyping environment is based on a concurrent programming kernel which supports the creation, blocking, and termination of processes, as well as scheduling and inter-process communication. Although the complexity of a distributed database system makes prototyping difficult, the implementation has proven satisfactory for experimentation on design choices, different database control techniques, and even an integrated evaluation of database systems. It supports a very flexible used interface, allowing a wide range of system configurations and workload characteristics. Since the prototyping environment is designed to provide a spectrum of database functions and operating system modules, it facilitates the construction of multiple system instances with different characteristics without much overhead. The expressive power and performance evaluation capability of the prototyping environment has been demonstrated by implementing real-time database systems and investigating the performance characteristics of priority-ceiling protocol and multiversion databases.< >

关键词： Prototypes distributed databases Database systems Real time systems Kernel Communication system control Control systems Operating systems Modular construction Protocols

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The influence of data replication in the knowledge discovery in distributed databases process

The influence of data replication in the knowledge discovery...

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International Conference on Electronics, Computers and Artificial Intelligence (ECAI)

作者： Valentin Pupezescu Radu Rădescu Applied Electronics & Information Engineering Dept. Polytechnic University of Bucharest Bucharest Romania

The process of knowledge discovery applied in distributed databases implies finding useful knowledge from mining data sets stored in real implementations of distributed databases. distributed databases represents a software system that allows a multitude of applications to access the data stored in local or remote databases. In this scenario, the data distribution is achieved through the process of replication. Nowadays many solutions for storing the data are available: relational distributed Database Management Systems (DBMS), NoSQL storing solutions, NewSQL storing solutions, graph oriented databases, object oriented databases, object-relational databases, etc. The present study analyzes the most commonly used storing solution: the relational model. The replication topology used in the related experiments was the classical publisher-subscriber topology. The distribution of data is made from the publisher system. The present work studies the interaction between the most suited distributed data mining architecture (distributed Committee Machines) for mining distributed data and real relational distributed databases. The chosen Data Mining task is the classification one. distributed Committee Machines are a group of neuronal networks working in a distributed procedure to obtain an improved classification performance compared to a single neural structure. In these experiments we used the classical multilayer perceptron trained with the backpropagation algorithm. The execution performance of the distributed Committee Machine is analyzed, based on some of the most used types of replication in relational databases: snapshot replication, merge replication, transactional replication, and transactional with queued updating replication. For all these types of replications the execution performances (distributed speedup and distributed efficiency) of the entire system is also analyzed. These results are useful to numerous research fields: adaptive e-learning applications, med

关键词： Neurons distributed databases Servers Data mining Multilayer perceptrons Testing

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A query optimization strategy for distributed databases on all-optical networks

A query optimization strategy for distributed databases on a...

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： S. Bandyopadhyay J. Morrissey A. Sengupta Sch. of Comput. Sci. Windsor Univ. Ont. Canada School of Computer Science University of Windsor Windsor ONT Canada Department of Com uter Science University of South Carolina Columbia SC USA

In the last ten years, optical communication has become a viable technology and is rapidly replacing computer communication based on copper wires. The speed of optical communication is much higher than the speed of electronic devices and we now need to re-examine the cost criteria for data communication in distributed computing. We have shown that the basic assumptions in query optimization for distributed databases are not valid in all-optical networks. We have proposed a new strategy for query optimization appropriate for such networks.

关键词： Query processing distributed databases Optical fiber communication Optical computing Copper Wires Costs Data communication distributed computing All-optical networks

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A mobile agent based protocol for distributed databases access

A mobile agent based protocol for distributed databases acce...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Yan Wang K.C.K. Law Kian-Lee Tan City University of Hong Kong Hong Kong China National University of Singapore Singapore

Presents a mobile agent-based three-tier protocol to improve the data transmission while accessing distributed databases. When a mobile agent is employed to fulfil a distributed query, it has many choices for travelling in the network. The master/slave pattern can be applied to mobile agents on the basis of a centralized two-phase commit (2PC) protocol to allow the parallel execution of mobile agents. In this paper, a three-tier protocol is proposed, which clusters all the slave agents to strengthen the parallelism. This three-tier protocol can significantly weaken the data transmission bottleneck and reduce the response time. This paper describes the protocol and a performance evaluation of it.

关键词： Mobile agents Access protocols distributed databases Data communication Mobile communication Network servers Transaction databases Application software Delay Dispatching

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