Statistical synopses for graph-structured XML databases
Proceedings of the 2002 ACM SIGMOD international conference on Management of data
Estimating Answer Sizes for XML Queries
EDBT '02 Proceedings of the 8th International Conference on Extending Database Technology: Advances in Database Technology
Counting Twig Matches in a Tree
Proceedings of the 17th International Conference on Data Engineering
Estimating the Selectivity of XML Path Expressions for Internet Scale Applications
Proceedings of the 27th International Conference on Very Large Data Bases
XPathLearner: an on-line self-tuning Markov histogram for XML path selectivity estimation
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
A histogram-based selectivity estimator for skewed XML data
DEXA'05 Proceedings of the 16th international conference on Database and Expert Systems Applications
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The increasing number of XML repositories has intensified research activities in the optimization of XML queries The success of any optimization approach hinges on an accurate query size estimation This paper presents a statistical method for estimating the result size of XML queries Our estimation system extracts two summarized information, namely, node ratio and node factor, from every distinct parent-child path in the XML files Experiment results indicate that our approach requires small memory footprint, and yet proves to be sufficient in estimating the result size of queries under the data-independent assumption.