350 search results - page 26 / 70 » An optimization framework for map-reduce queries |
218
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ICDE
2007
IEEE
16 years 1 months ago
2007
IEEE
Incompleteness due to missing attribute values (aka "null values") is very common in autonomous web databases, on which user accesses are usually supported through media...
117
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TKDE
2010
14 years 10 months ago
2010
—Efficiency and privacy are two fundamental issues in moving object monitoring. This paper proposes a privacy-aware monitoring (PAM) framework that addresses both issues. The fra...
102
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DAWAK
1999
Springer
15 years 4 months ago
1999
Springer
One of the most challenging problems in data manipulation in the future is to be able to e ciently handle very large databases but also multiple induced properties or generalizatio...
186
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SIGMOD
2009
ACM
16 years 20 days ago
2009
ACM
We present a complete XPath cost-based optimization and execution framework and demonstrate its effectiveness and efficiency for a variety of queries and datasets. The framework i...
111
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SIGMOD
2004
ACM
16 years 18 days ago
2004
ACM
Cardinality estimation during query optimization relies on simplifying assumptions that usually do not hold in practice. To diminish the impact of inaccurate estimates during opti...