The Flamenco system is a web search interface that allows users to browse through large data sets using predefined hierarchical faceted metadata. It is built on top of a conventional relational database and currently scales to collections of several tens of thousands of items. In the current implementation, the system translates each user query into multiple SQL group-by commands in order to obtain query preview information for possible future queries. These group-by's take up a significant fraction of the query processing time. In this note, we describe an optimization that allows us to speed up the group-by computations dramatically. Our ideas have some similarity to the work of Beyer and Ramakrishnan on computing iceberg data cubes.
Title
Computing Query Previews in the Flamenco System
Published
2004-01-26
Full Collection Name
Electrical Engineering & Computer Sciences Technical Reports
Other Identifiers
CSD-04-1303
Type
Text
Extent
13 p
Archive
The Engineering Library
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