2724 search results - page 260 / 545 » Optimizing Queries on Files |
151
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ATMOS
2007
15 years 5 months ago
2007
In railways systems the timetable is typically represented as a weighted digraph on which itinerary queries are answered by shortest path algorithms, usually running Dijkstra’s a...
246
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ICDE
2003
IEEE
16 years 5 months ago
2003
IEEE
Expressing complex OLAP queries using group-by, aggregation, and joins can be extremely difficult. As a result of this, many alternate ways of expressing such queries have been de...
113
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KDD
1997
ACM
15 years 8 months ago
1997
ACM
An approach to defining actionability as a measure of interestingness of patterns is proposed. This approach is based on the concept of an action hierarchy which is defined as a t...
119
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SODA
2008
ACM
15 years 5 months ago
2008
ACM
A data structure is presented for point location in convex planar subdivisions when the distribution of queries is known in advance. The data structure has an expected query time t...
234
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ICDE
2006
IEEE
16 years 5 months ago
2006
IEEE
Database columns are often correlated, so that cardinality estimates computed by assuming independence often lead to a poor choice of query plan by the optimizer. Multidimensional...