486 search results - page 51 / 98 » Evaluating Top-k Queries over Web-Accessible Databases |
124
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SSDBM
1999
IEEE
15 years 5 months ago
1999
IEEE
Conducting bioinformatic analyses involves biologists in expressing requests over a range of highly heterogeneous information sources and software tools. Such activities are labor...
110
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ECIR
2006
Springer
15 years 2 months ago
2006
Springer
Abstract. In this paper, we propose a common phrase index as an efficient index structure to support phrase queries in a very large text database. Our structure is an extension of ...
109
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EDBT
2004
ACM
15 years 7 months ago
2004
ACM
Abstract. We present a cost-based adaptive clustering method to improve average performance of spatial queries (intersection, containment, enclosure queries) over large collections...
101
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ICDT
1999
ACM
15 years 5 months ago
1999
ACM
A large number of database index structures have been proposed over the last two decades, and little consensus has emerged regarding their relative e ectiveness. In order to empir...
122
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VLDB
2005
ACM
15 years 7 months ago
2005
ACM
Nested iteration is an important technique for query evaluation. It is the default way of executing nested subqueries in SQL. Although decorrelation often results in cheaper non-n...