712 search results - page 98 / 143 » Decoupled Query Optimization for Federated Database Systems |
VLDB
1989
ACM
15 years 6 months ago
1989
ACM
We present a framework for the estimation of the size of binary recursively defined relations. We show how the framework can be used to provide estimating algo rithms for the size...
120
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VLDB
2007
ACM
15 years 8 months ago
2007
ACM
Real-world datasets exhibit a complex dependency structure among the data attributes. Learning this structure is a key task in automatic statistics configuration for query optimi...
203
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PODS
2009
ACM
16 years 2 months ago
2009
ACM
Let be a finite, ordered alphabet, and consider a string x = x1x2 . . . xn n . A secondary index for x answers alphabet range queries of the form: Given a range [al, ar] , retu...
109
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VLDB
2001
ACM
15 years 6 months ago
2001
ACM
Queries navigate semistructured data via path expressions, and can be accelerated using an index. Our solution encodes paths as strings, and inserts those strings into a special i...
124
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ICDT
2005
ACM
15 years 7 months ago
2005
ACM
Abstract. A classical problem in query optimization is to find the optimal ordering of a set of possibly correlated selections. We provide an ion of this problem as a generalizati...