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We measured XPath query performance with two XML database packages using a large sample of XML documents and queries utilizing both the document structure and keywords. One of the packages is a “native” XML database, and the other one an XML-enabled relational database system. With large number of documents, both packages have performance problems. Using MongoDB improves the performance of some of the queries significantly, with some limitations on the expressive power of the query language. This is most likely an acceptable trade-off in most of the application scenarios.
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