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In real-time data warehouses, data import is no longer implemented in the batched and periodic way during the idle time of data warehouses, but continuously ongoing. The updates of real-time data warehouses are conflict with queries against data warehouses. Thus the scheduling of updates and queries becomes a key issue. This paper proposes a priority-based balance scheduling algorithm (PBBS). Firstly,...
In the data integration, the heterogeneity of sources leads to missing value and various expressions of the same value in records, which reduces the quality of data. In this paper, we propose a novel approach to reinforce records for the integrated data. By studying the functional dependency of attribute in schema of data integration, we discover the related attribute that determines the attribute...
Web based data integration systems run in an unpredictable and dynamic environment, which makes the traditional query processing approach inapplicable. Problems necessitating AQP (Adaptive Query Processing) techniques include: (1) statistics may be insufficient; (2) statistics may be imprecise; (3) unavailable data sources may make query results incomplete. In this paper, we present a novel data integration...
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