Database aggregation query result estimator
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United States of America Patent
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-
Apr 22, 2008
Grant Date -
Feb 16, 2006
app pub date -
Oct 7, 2005
filing date -
Jan 12, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
Aggregation queries are performed by first identifying outlier values, aggregating the outlier values, and sampling the remaining data after pruning the outlier values. The sampled data is extrapolated and added to the aggregated outlier values to provide an estimate for each aggregation query. Outlier values are identified by selecting values outside of a selected sliding window of data having the lowest variance. An index is created for the outlier values. The outlier data is removed from the window of data, and separately aggregated. The remaining data without the outliers is then sampled to provide a statistically relevant sample that is then aggregated and extrapolated to provide an estimate for the remaining data. This sampled estimate is combined with the outlier aggregate to form an estimate for the entire set of data.
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