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» A System for Semantic Query Optimization
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BTW
1993
Springer
193views Database» more  BTW 1993»
14 years 1 months ago
Query Optimization in an OODBMS
It is clearly crucial for the success of object-oriented databases to find effiĆ cient implementations that improve on the performance of relational sysĆ tems, rather than being...
Christian Rich, Marc H. Scholl
SIGMOD
2002
ACM
172views Database» more  SIGMOD 2002»
14 years 9 months ago
Automating physical database design in a parallel database
Physical database design is important for query performance in a shared-nothing parallel database system, in which data is horizontally partitioned among multiple independent node...
Jun Rao, Chun Zhang, Nimrod Megiddo, Guy M. Lohman
EDBT
2012
ACM
214views Database» more  EDBT 2012»
11 years 11 months ago
An optimization framework for map-reduce queries
We present an effective optimization framework for general SQLlike map-reduce queries, which is based on a novel query algebra and uses a small number of higher-order physical ope...
Leonidas Fegaras, Chengkai Li, Upa Gupta
SEBD
2007
114views Database» more  SEBD 2007»
13 years 10 months ago
A New Type of Metadata for Querying Data Integration Systems
Research on data integration has provided languages and systems able to guarantee an integrated intensional representation of a given set of data sources. A significant limitation...
Sonia Bergamaschi, Francesco Guerra, Mirko Orsini,...
COOPIS
2002
IEEE
14 years 2 months ago
Well-Founded Optimism: Inheritance in Frame-Based Knowledge Bases
Abstract. F-logic is a popular formalism for knowledge-intensive applications and, especially, for ontology management in Semantic Web. However, the original F-logic’s semantics ...
Guizhen Yang, Michael Kifer