Stream processing of XPath queries with predicates

Authors:
Ashish Kumar Gupta;Dan Suciu
Affiliations:
University of Washington;University of Washington
Venue:
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
Year:
2003

Citing 19
Cited 118

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Abstract

We consider the problem of evaluating large numbers of XPath filters, each with many predicates, on a stream of XML documents. The solution we propose is to lazily construct a single deterministic pushdown automata, called the XPush Machine from the given XPath fllters. We describe a number of optimization techniques to make the lazy XPush machine more efficient, both in terms of space and time. The combination of these optimizations results in high, sustained throughput. For example, if the total number of atomic predicates in the filters is up to 200000, then the throughput is at least 0.5 MB/sec: it increases to 4.5 MB/sec when each fllter contains a single predicate.