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» On Bounded Queries and Approximation
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PODS
2012
ACM
253views Database» more  PODS 2012»
13 years 9 months ago
Local transformations and conjunctive-query equivalence
Over the past several decades, the study of conjunctive queries has occupied a central place in the theory and practice of database systems. In recent years, conjunctive queries h...
Ronald Fagin, Phokion G. Kolaitis
ECCV
2002
Springer
16 years 8 months ago
Shock-Based Indexing into Large Shape Databases
This paper examines issues arising in applying a previously developed edit-distance shock graph matching technique to indexing into large shape databases. This approach compares th...
Thomas B. Sebastian, Philip N. Klein, Benjamin B. ...
PODS
2011
ACM
220views Database» more  PODS 2011»
14 years 9 months ago
Maximizing conjunctive views in deletion propagation
In deletion propagation, tuples from the database are deleted in order to reflect the deletion of a tuple from the view. Such an operation may result in the (often necessary) del...
Benny Kimelfeld, Jan Vondrák, Ryan Williams
SIGMOD
2001
ACM
124views Database» more  SIGMOD 2001»
16 years 6 months ago
Space-Efficient Online Computation of Quantile Summaries
An -appro ximate quantile summary of a sequence of N elements is a data structure that can answer quantile queries about the sequence to within a precision of N. We presen t a new...
Michael Greenwald, Sanjeev Khanna
ICDCS
2008
IEEE
16 years 1 months ago
Scalable and Adaptive Metadata Management in Ultra Large-Scale File Systems
This paper presents a scalable and adaptive decentralized metadata lookup scheme for ultra large-scale file systems (≥ Petabytes or even Exabytes). Our scheme logically organiz...
Yu Hua, Yifeng Zhu, Hong Jiang, Dan Feng, Lei Tian