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» On the Efficiency of Provenance Queries
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HPTS
1993
146views Database» more  HPTS 1993»
15 years 10 months ago
Parallel Query Processing in Shared Disk Database Systems
System developments and research on parallel query processing have concentrated either on "Shared Everything" or "Shared Nothing" architectures so far. While t...
Erhard Rahm
DASFAA
2004
IEEE
110views Database» more  DASFAA 2004»
15 years 10 months ago
Optimising Mediator Queries to Distributed Engineering Systems
Data and computations of a CAD system have been wrapped by a mediator system using CORBA's IIOP Protocol. This allows ad hoc declarative mediator queries to be translated into...
Mattias Nyström, Tore Risch
TDM
2004
202views Database» more  TDM 2004»
15 years 8 months ago
Combining Indexing Schemes to Accelerate Querying XML on Content and Structure
This paper presents the advantages of combining multiple document representation schemes for query processing of XML queries on content and structure. We show how extending the Te...
Georgina Ramírez, Arjen P. de Vries
NJC
2006
102views more  NJC 2006»
15 years 6 months ago
Online Evaluation of Regular Tree Queries
Regular tree queries (RTQs) are a class of queries considered especially relevant for the expressiveness and evaluation of XML query languages. The algorithms proposed so far for ...
Alexandru Berlea
PVLDB
2008
101views more  PVLDB 2008»
15 years 6 months ago
Output perturbation with query relaxation
Given a dataset containing sensitive personal information, a statistical database answers aggregate queries in a manner that preserves individual privacy. We consider the problem ...
Xiaokui Xiao, Yufei Tao