549 search results - page 81 / 110 » Data Expiration and Aggregate Queries |
191
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VLDB
2007
ACM
16 years 1 days ago
2007
ACM
The modeling of high level semantic events from low level sensor signals is important in order to understand distributed phenomena. For such content-modeling purposes, transformat...
102
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VLDB
2000
ACM
15 years 3 months ago
2000
ACM
Approximate query answering systems provide very fast alternatives to OLAP systems when applications are tolerant to small errors in query answers. Current sampling-based approach...
100
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SIGMOD
1997
ACM
15 years 4 months ago
1997
ACM
: The read-mostly environment of data warehousing makes it possible to use more complex indexes to speed up queries than in situations where concurrent updatesare present. The curr...
SIGMOD
2002
ACM
15 years 12 months ago
2002
ACM
In this paper, we ask if the traditional relational query acceleration techniques of summary tables and covering indexes have analogs for branching path expression queries over tr...
WWW
2004
ACM
16 years 15 days ago
2004
ACM
When searching large hypertext document collections, it is often possible that there are too many results available for ambiguous queries. Query refinement is an interactive proce...