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Early Separation of Filter and Refinement Steps in Spatial Query Optimization
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Ho-Hyun Park,
Chan-Gun Lee,
Yong-Ju Lee, and
Chin-Wan Chung
View Paper (PDF)
Return to Session 3B: Spatial Databases
The
spatial query has been processed in two steps, the filter step and the
refinement step, due to a large volume and high complexity of the spatial data.
However, this approach has been considered only in the query execution phase
after completing the query optimization phase. This paper presents query optimization
strategies which take the characteristics of spatial databases into account.
The first strategy is the separation of filter and refinement steps not in the
query execution phase but in the query optimization phase.
As the second
strategy, several refinement operations can be combined in processing a complex
query, and as the third strategy several filter operations can also be
combined. We call the optimization technique utilizing these strategies the
Early Separated Filter And Refinement (ESFAR). This paper also presents a
rule-based optimization technique for ESFAR.
Copyright(C) 2000 ACM
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