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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 資訊工程學系 > 期刊論文 >  An adaptive scheduler for distributed real-time database systems


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    题名: An adaptive scheduler for distributed real-time database systems
    作者: Chen, Hong-Ren;Chin, Y. H.
    教師: 金陽和
    日期: 2003
    出版者: Elsevier
    關聯: INFORMATION SCIENCES,Volume 153,Pages 55-83,JUL 2003
    关键词: Information science
    Database systems
    Real time systems
    Computer operating systems
    Concurrency control
    Computer simulation
    摘要: In a distributed real-time database system, a remote transaction usually accesses some data located at remote sites. However, traditional real-time schedulers do not consider the impact of communication delay in transferring remote data, resulting in a high MissRatio for remote transactions. This study proposes a new real-time scheduler called flexible high reward (FHR) to reduce the MissRatio and lessen the unnecessary waiting time due to communication delay for a remote transaction. This scheduler gives a remote transaction a slightly higher priority and adjusts a remote transaction's waiting status such that the resources held by a waiting remote transaction can be released as soon as possible. Through the underlying operating system, local transactions can also be executed while a remote transaction is waiting for remote data. Simulation results demonstrate that the FHR outperforms current real-time schedulers such as earliest deadline, highest value, and highest reward and urgency.
    URI: http://www.elsevier.com/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/65950
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