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    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/69153


    Title: Efficient Query Processing in Integrated Multiple Object Databases with Maybe Result Certification
    Authors: 陳良弼
    Koh,Jia-Ling;Chen,Arbee L.P.
    Contributors: 資科系
    Date: 2002-07
    Issue Date: 2014-08-21 15:09:24 (UTC+8)
    Abstract: Within integrated multiple object databases, missing data occurs due to the missing attribute conflict as well as the existence of null values. A set of algorithms is provided in this paper to process the predicates of global queries with missing data. To provide more informative answers to users, the "maybe" results due to missing data are presented in addition to the "certain" results. The local "maybe" results may become "certain" results via the concept of object isomerism. One algorithm is designed based on the centralized approach in which data are forwarded to the same site for integration and processing. Furthermore, to reduce the response time, localized approaches evaluate the predicates within distinct component databases in parallel. The object signature is also applied in the design to further reduce the data transfer. These algorithms are compared and discussed according to the simulation results of both the total execution and response times. Alternately, the global schema may contain multi-valued attributes with values derived from attribute values in different component databases. Hence, the proposed approaches are also extended to process the global queries involving this kind of multi-valued attribute
    Relation: IEEE Transactions on Knowledge and Data Engineering (EI,SCI),14(4),691-708
    Data Type: article
    Appears in Collections:[Department of Computer Science ] Periodical Articles

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