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XQuery evaluation over XML streams requires the temporary buffering of XML elements. This paper presents a semantic query optimization solution to minimize memory footprint during XQuery evaluation by exploiting schema knowledge. The focus is on one particular class of constraints, namely, the Pattern Non-Occurrence (PNO) constraints for XML streams conforming to pre-defined DTDs. PNO constraints facilitate the early release of buffered data (early buffer release) or possibly avoid to ever store the data (buffer avoidance), thus achieving a minimized memory foot-print. An automaton-based technique is developed to detect PNO constraints at runtime.

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Format:PDFSize:249 KB
Date:Feb 2008
Pages:10

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