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標題Title: Flexible Data Cube for Range-Sum Queries in Dynamic OLAP Data Cubes
作者Authors: 李育強,C.-I..等
上傳單位Department: 資訊工程系
上傳時間Date: 2009-12-1
上傳者Author: 李育強
審核單位Department: 資訊工程系
審核老師Teacher: 李育強
檔案類型Categories: 論文Thesis
關鍵詞Keyword: Range-Sum Query, OLAP, Prefix sum, Data cube
摘要Abstract: The data cube is frequently adopted to implement On-Line Analytical Processing (OLAP) and provides aggregate information to support the analysis of contents of databases and data warehouses. Range-sum queries require accessing large data cubes and adding the contents of massive cells immediately. Techniques have thus been proposed to accelerate range-sum queries by applying pre-aggregated specified cells of data cubes. However, this faster response leads to higher update cost and possible need for extra memory space overhead to store these pre-aggregated values. To offer the best trade-off choice, this study presents a novel approach that considers both query cost and update cost to construct data cubes. In addition, we shall also construct a space-optimal high-dimensional data cube and propose a flexible and optimal framework, called the Flexible Data Cube (FDC) approach. The FDC method can support a model to select or integrate these pre-aggregation techniques for each dimension.

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2009_12_da285e45.pdf 472Kb pdf 442 154
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