Selectivity estimation for processing sql queries containing...

Details Selectivity estimation for processing sql queries containing... Selectivity estimation for processing sql queries containing...

G - Physics

06

F

G06F 17/30 (2006.01)

Patent

CA 2306928

The estimate of the selectivity of a HAVING clause in an SQL query is carried out by within a specified time constraint by determining a selectivity estimate for each member in a sample set of group sizes for the HAVING clause using a probabilistic model based on an assumed value distribution. The selectivity estimates for the groups in the sample set are used to interpolate estimates for all possible group sizes and the estimates are combined based on an assumed known group size distribution to provide an estimation of the selectivity for the HAVING clause. Different selectivity estimating approaches are used for each group size based on available time for estimating and on the estimated time to complete the estimate using different techniques.

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