Heavy-tailed probability distributions in the World Wide Web
A practical guide to heavy tails
ToXgene: a template-based data generator for XML
Proceedings of the 2002 ACM SIGMOD international conference on Management of data
Query processing of streamed XML data
Proceedings of the eleventh international conference on Information and knowledge management
Optimizing Regular Path Expressions Using Graph Schemas
ICDE '98 Proceedings of the Fourteenth International Conference on Data Engineering
Answering XML Queries on Heterogeneous Data Sources
Proceedings of the 27th International Conference on Very Large Data Bases
An XML query engine for network-bound data
The VLDB Journal — The International Journal on Very Large Data Bases
Stream processing of XPath queries with predicates
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
XPath queries on streaming data
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
Structural Joins: A Primitive for Efficient XML Query Pattern Matching
ICDE '02 Proceedings of the 18th International Conference on Data Engineering
Raindrop: a uniform and layered algebraic framework for XQueries on XML streams
CIKM '03 Proceedings of the twelfth international conference on Information and knowledge management
Hash-Merge Join: A Non-blocking Join Algorithm for Producing Fast and Early Join Results
ICDE '04 Proceedings of the 20th International Conference on Data Engineering
Semantic caching for xml queries
Semantic caching for xml queries
Early hash join: a configurable algorithm for the efficient and early production of join results
VLDB '05 Proceedings of the 31st international conference on Very large data bases
A transducer-based XML query processor
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Query processing for high-volume XML message brokering
VLDB '03 Proceedings of the 29th international conference on Very large data bases - Volume 29
Load shedding in a data stream manager
VLDB '03 Proceedings of the 29th international conference on Very large data bases - Volume 29
FluXQuery: an optimizing XQuery processor for streaming XML data
VLDB '04 Proceedings of the Thirtieth international conference on Very large data bases - Volume 30
A stratified approach to progressive approximate joins
EDBT '08 Proceedings of the 11th international conference on Extending database technology: Advances in database technology
Utility-driven load shedding for xml stream processing
Proceedings of the 17th international conference on World Wide Web
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Because of high volumes and unpredictable arrival rates, stream processing systems are not always able to keep up with input data - resulting in buffer overflow and uncontrolled loss of data. To produce eventually complete results, load spilling, which pushes some fractions of data to disks temporarily, is commonly employed in relational stream engines. In this work, we now introduce "structure-based spilling", a spilling technique customized for XML streams by considering the partial spillage of possibly complex XML elements. Such structure-based spilling brings new challenges. When a path is spilled, multiple paths may be affected. We analyze possible spilling effects on the query paths and how to execute the "reduced" query to produce partial results. To select the reduced query that maximizes output quality, we develop three optimization strategies, namely, OptR, OptPrune and ToX. We also examine the clean-up stage to guarantee that an entire result set is eventually generated by producing supplementary results. Our experimental study demonstrates that our proposed solutions consistently achieve higher quality results compared to the state-of-the-art techniques.