3225 search results - page 252 / 645 » Query Optimization by Stored Queries |
259
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SIGMOD
2009
ACM
16 years 6 months 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...
165
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EDBT
2004
ACM
16 years 6 months ago
2004
ACM
The join operation, which combines tuples from multiple relations, is the most fundamental and, typically, the most expensive operation in database queries. The standard approach t...
303
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ICDE
2007
IEEE
16 years 7 months ago
2007
IEEE
The ability to store and query uncertain information is of great benefit to databases that infer values from a set of observations, including databases of moving objects, sensor r...
262
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ICDE
2006
IEEE
16 years 7 months ago
2006
IEEE
"Sparse" data, in which relations have many attributes that are null for most tuples, presents a challenge for relational database management systems. If one uses the no...
245
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VLDB
2007
ACM
16 years 6 months ago
2007
ACM
Given a set of multidimensional data points, skyline query retrieves a set of data points that are not dominated by any other points. This query is useful for multi-preference ana...