148 search results - page 8 / 30 » Query Selectivity Estimation for Uncertain Data |
VLDB
2004
ACM
14 years 25 days ago
2004
ACM
Cost-based XML query optimization calls for accurate estimation of the selectivity of path expressions. Some other interactive and internet applications can also benefit from suc...
DEXAW
2007
IEEE
13 years 11 months ago
2007
IEEE
The problem of efficiently evaluating XPath and XQuery queries has become increasingly significant since more and more XML data is stored in its native form. We propose a novel op...
SIGMOD
1999
ACM
13 years 11 months ago
1999
ACM
The database query optimizer requires the estimation of the query selectivity to find the most efficient access plan. For queries referencing multiple attributes from the same rel...
WWW
2008
ACM
14 years 8 months ago
2008
ACM
In this paper, we formalize the problem of Basic Graph Pattern (BGP) optimization for SPARQL queries and main memory graph implementations of RDF data. We define and analyze the c...
WAIM
2004
Springer
14 years 25 days ago
2004
Springer
Selectivity estimation of path expressions in querying XML data plays an important role in query optimization. A path expression may contain multiple branches with predicates, each...