The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

V.s. Alagar - One of the best experts on this subject based on the ideXlab platform.

  • Specification of real-time Distributed Database systems
    CompEuro 1992 Proceedings Computer Systems and Software Engineering, 1992
    Co-Authors: G. Ramanathan, V.s. Alagar
    Abstract:

    A unified framework is given for the specification of external consistency constraints, integrity constraints, and temporal consistency constraints of a real-time Distributed Database system. The formalism is event based and facilitates both relative and quantitative reasoning about time. The functional model of V.S. Alagar and G. Ramanathan (1991) is extended with constructs needed to specify the requirements of real-time Databases. To illustrate the use of these constructs, the specification and proof of correctness of a real-time concurrency control protocol are presented.

G. Ramanathan - One of the best experts on this subject based on the ideXlab platform.

  • Specification of real-time Distributed Database systems
    CompEuro 1992 Proceedings Computer Systems and Software Engineering, 1992
    Co-Authors: G. Ramanathan, V.s. Alagar
    Abstract:

    A unified framework is given for the specification of external consistency constraints, integrity constraints, and temporal consistency constraints of a real-time Distributed Database system. The formalism is event based and facilitates both relative and quantitative reasoning about time. The functional model of V.S. Alagar and G. Ramanathan (1991) is extended with constructs needed to specify the requirements of real-time Databases. To illustrate the use of these constructs, the specification and proof of correctness of a real-time concurrency control protocol are presented.

Yingying Yu - One of the best experts on this subject based on the ideXlab platform.

  • The Semi-join Query Optimization In Distributed Database System
    Proceedings of 2012 National Conference on Information Technology and Computer Science, 2012
    Co-Authors: Lin Zhou, Yan Chen, Taoying Li, Yingying Yu
    Abstract:

    In Distributed Database system, the Distributed deposition and redundancy data brought convenient to fault recovery, but they make Distributed query processing more complicated at the same time. Query optimization and processing is one of the key technologies in Distributed Database system. It generally uses semi-join operation to improve the time response performance of query and reduce communication cost. This paper briefly described the corresponding concepts and characteristics of Distributed Database system, summarized the goals of Distributed Database query optimization, and analyzed the query optimization process based on semi-join operation combined with the practical application. In addition, it introduced a classical algorithm which is used for multiple connection and query optimization based on the semi-join query optimization, the SDD-1 algorithm. Keywords-Distributed Database; semi-join operation; query optimization

Gurdev Singh - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of Joins and Semi-joins in Centralized and Distributed Database Queries
    2012 International Conference on Computing Sciences, 2012
    Co-Authors: Manik Sharma, Gurdev Singh
    Abstract:

    Database is defined as collection of files or table, where as DBMS stands for Database Management System which is collection of unified programs used to manage overall activities of the Database. The two dominant approaches used for storing and managing Database are centralized Database management system and Distributed Database management system in which data is placed at central location and Distributed over several locations respectively. Independent of the Database approach used, one of the foremost issue in the Database is the retrieval of data by using multiple table from central repository in centralized Database and from number of sites in Distributed Database. Joins and semi joins are primitive operations used to extract required information from one, two or multiple tables. In this paper the focus is given on computing and analyzing the performance of joins and semi joins in centralized as well as in Distributed Database system. The various metrics that will be considered while analyzing performance of join and semi join in centralized Database and Distributed Database system are Query Cost, Memory used, CPU Cost, Input Output Cost, Sort Operations, Data Transmission, Total Time and Response Time. In short the intention of this study is compare and contrasts the behavior join and semi-join approach in centralized and Distributed Database system.

F.a. Schreiber - One of the best experts on this subject based on the ideXlab platform.

  • Notes on real-time Distributed Database systems stability
    Proceedings of the 5th Jerusalem Conference on Information Technology 1990. 'Next Decade in Information Technology', 1990
    Co-Authors: F.a. Schreiber
    Abstract:

    Issues regarding the effect of routing and load-balancing algorithms on the stability of a fault-tolerant Distributed Database system are examined. Reference is mainly to control algorithms. It is shown that the behavior of the routing algorithm is vital for the dependability of the system, and that the transitions induced by the algorithm should be stable or at least transitively stable. Degradation indexes are defined for the system dependability, and some open questions are raised.