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| 滑动窗口规模的动态调整算法 |
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李建中1,2, 张冬冬1
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1.哈尔滨工业大学,计算机科学与技术学院,黑龙江,哈尔滨,150001;2.黑龙江大学,计算机科学与技术学院,黑龙江,哈尔滨,150080
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| 摘要: |
| 讨论当数据流系统的数据流流速或连续查询发生变化时,滑动窗口规模的动态调整问题.根据可用内存空间大小和连续查询需求,提出了3类动态调整滑动窗口规模的算法,实现了对连续查询3种服务质量级别的支持,提高了连续查询处理的效率和效果.理论分析与实验结果表明,提出的算法可以有效地应用于数据流系统. |
| 关键词: 数据流 滑动窗口 连续查询 滑动窗口规模调整 |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant No.60273082 (国家自然科学基金); the National High-Tech Research and Development Plan of China under Grant No.2002AA444110 (国家高技术研究发展计划(863)); the NationalGrand Fundamental Research 973 Program of China under Grant No.G1999032704 (国家重点基础研究发展规划(973)); the Natural Science Foundation of Heilongjiang Province of China under Grant No.zjg03-05 (黑龙江省自然科学基金) |
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| Algorithms for Dynamically Adjusting the Sizes of Sliding Windows |
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LI Jian-Zhong,ZHANG Dong-Dong
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| Abstract: |
| The problem of dynamically adjusting the sizes of sliding windows when the rates of data streams or continuous queries change in data stream systems is studied in this paper. Based on the amount of available memory resource and the requirement of queries, three classes of algorithms for dynamically adjusting the sizes of sliding windows are proposed. These algorithms provide three levels of quality of service to all kinds of continuous queries and enhance the efficiency and effectiveness of processing continuous queries. Analytical and experimental results show that the algorithms can be applied to data stream systems effectively. |
| Key words: data stream sliding window continuous query adjustment of sliding window size |
