549 search results - page 69 / 110 » Data Expiration and Aggregate Queries |
SIGMOD
1999
ACM
15 years 4 months ago
1999
ACM
In large data warehousing environments, it is often advantageous to provide fast, approximate answers to complex aggregate queries based on statistical summaries of the full data....
VLDB
1990
ACM
15 years 3 months ago
1990
ACM
In this paper, we describe a new indexing technique, the time indez, for improving the performance of certain classes of temporal queries. The time index can be used to retrieve v...
DOLAP
2003
ACM
15 years 5 months ago
2003
ACM
The data cube operator exemplifies two of the most important aspects of OLAP queries: aggregation and dimension hierarchies. In earlier work we presented Dwarf, a highly compress...
198
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ICDE
2008
IEEE
16 years 1 months ago
2008
IEEE
Recently, as more and more social network data has been published in one way or another, preserving privacy in publishing social network data becomes an important concern. With som...
127
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CORR
2010
Springer
14 years 8 months ago
2010
Springer
Because of the increasing number of electronic data, designing efficient tools to retrieve and exploit documents is a major challenge. Current search engines suffer from two main d...