Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Rank-Aware Query Processing

  • Ihab F. Ilyas
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_80680

Synonyms

Top-k Query Processing

Definition

Rank-aware query processing refers to the efficient processing of a top-k query taking into account the ranking requirements on output results. A naïve way to process a top-k query is to calculate the full set of results and then sort them based on the ranking function; the top-k results are presented as the final query answers. Such a naïve materialize-then-sort scheme can be prohibitively expensive. Integrating top-k queries in SQL query engines requires addressing the challenge of making an RDBMS rank-aware. This requires introducing new constructs in the whole system including the data model, algebra, query operators, and query optimization techniques.

Historical Background

The need for rank-aware query processing arose since the introduction of top-k queries with score aggregation and rank joins to the database community. Fagin et al. [1] first introduced the problem of ranking a database of objects, given several rankings of the...

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Recommended Reading

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Cheriton School of Computer ScienceUniversity of WaterlooWaterlooCanada