995 search results - page 44 / 199 » Optimization of Complex Nested Queries in Relational Databas... |
113
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VLDB
1987
ACM
15 years 5 months ago
1987
ACM
A Datalog program can be translated into a system of fixpoint equations of relational algebra; this paper studies how such a system can be solved and optimized for a particular qu...
140
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TJS
2008
15 years 1 months ago
2008
XML is a flexible and powerful tool that enables information and security sharing in heterogeneous environments. Scalable technologies are needed to effectively manage the growing...
216
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SIGMOD
2006
ACM
16 years 2 months ago
2006
ACM
This paper introduces the Tuple Graph (TuG) synopses, a new class of data summaries that enable accurate selectivity estimates for complex relational queries. The proposed summari...
158
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TDM
2004
15 years 3 months ago
2004
This work may be seen as a further proof of the versatility of the relational database model. Here, we add XQuery to the catalog of languages which RDBMSs are able to "speak&...
129
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ESWS
2011
Springer
14 years 5 months ago
2011
Springer
The emergence of the Semantic Web has led to the creation of large semantic knowledge bases, often in the form of RDF databases. Improving the performance of RDF databases necessit...