INEX'09 Proceedings of the Focused retrieval and evaluation, and 8th international conference on Initiative for the evaluation of XML retrieval
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For the INEX Efficiency Track 2008, we were just on time to finish and evaluate our brand-new TopX 2.0 prototype. Complementing our long-running effort on efficient top-k query processing on top of a relational back-end, we now switched to a compressed object-oriented storage for text-centric XML data with direct access to customized inverted files, along with a complete reimplementation of the engine in C++. Our INEX 2008 experiments demonstrate efficiency gains of up to a factor of 30 compared to the previous Java/JDBC-based TopX 1.0 implementation over a relational back-end. TopX 2.0 achieves overall runtimes of less than 51 seconds for the entire batch of 568 Efficiency Track topics in their content-and-structure (CAS) version and less than 29 seconds for the content-only (CO) version, respectively, using a top-15, focused (i.e., non-overlapping) retrieval mode--an average of merely 89 ms per CAS query and 49 ms per CO query.