Optimal aggregation algorithms for middleware
PODS '01 Proceedings of the twentieth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Optimizing Multi-Feature Queries for Image Databases
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
Evaluating top-k queries over web-accessible databases
ACM Transactions on Database Systems (TODS)
Best position algorithms for top-k queries
VLDB '07 Proceedings of the 33rd international conference on Very large data bases
A survey of top-k query processing techniques in relational database systems
ACM Computing Surveys (CSUR)
Similarity measures for binary and numerical data: a survey
International Journal of Knowledge Engineering and Soft Data Paradigms
Information Systems for Federated Biobanks
Transactions on Large-Scale Data- and Knowledge-Centered Systems I
Efficient top-k retrieval for user preference queries
Proceedings of the 2011 ACM Symposium on Applied Computing
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Efficient retrieval of the most relevant (i.e. top-k) tuples is an important requirement in information management systems which access large amounts of data. In general answering a top-k query request means to retrieve the k objects which score best for an objective function. We propose some improvements to the best position algorithm (BPA-2) [2]. To the best of our knowledge BPA-2 is currently the fastest available top-k query answering approach based on the widely known and applied Threshold Algorithm (short TA) of Fagin et al. [5]. Our proposed improvements lead to significantly reduced time and memory consumption and better scalability compared to BPA-2: (1) we dynamically create value rather than object based index structures out of the query restrictions posed by the user, (2) we introduce look-ahead techniques to process those index structures. While BPA-2 processes all precalculated indexes in parallel we always examine the most promising indexing structure next. We prototypically implemented our fast top-k query answering (FTA) approach. Our experiments showed an improvement by one to two orders of magnitude over BPA-2.