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» Optimizing joins in a map-reduce environment
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ICDE
2008
IEEE
147views Database» more  ICDE 2008»
14 years 9 months ago
Flow Algorithms for Parallel Query Optimization
In this paper we address the problem of minimizing the response time of a multi-way join query using pipelined (inter-operator) parallelism, in a parallel or a distributed environ...
Amol Deshpande, Lisa Hellerstein
ICDE
2007
IEEE
173views Database» more  ICDE 2007»
14 years 9 months ago
Adaptive Load Diffusion for Multiway Windowed Stream Joins
In this paper, we present an adaptive load diffusion operator to enable scalable processing of Multiway Windowed Stream Joins (MWSJs) using a cluster system. The load diffusion is...
Xiaohui Gu, Philip S. Yu, Haixun Wang
SSDBM
2003
IEEE
196views Database» more  SSDBM 2003»
14 years 24 days ago
Stream Window Join: Tracking Moving Objects in Sensor-Network Databases
The widespread use of sensor networks presents revolutionary opportunities for life and environmental science applications. Many of these applications involve continuous queries t...
Moustafa A. Hammad, Walid G. Aref, Ahmed K. Elmaga...
IROS
2006
IEEE
120views Robotics» more  IROS 2006»
14 years 1 months ago
Optimal local map size for EKF-based SLAM
Abstract— In this paper we show how to optimize the computational cost and maximize consistency in EKF-based SLAM for large environments. We combine Local Mapping with Map Joinin...
Lina María Paz, José Neira
SIGMOD
2003
ACM
196views Database» more  SIGMOD 2003»
14 years 7 months ago
Spreadsheets in RDBMS for OLAP
One of the critical deficiencies of SQL is lack of support for ndimensional array-based computations which are frequent in OLAP environments. Relational OLAP (ROLAP) applications ...
Andrew Witkowski, Srikanth Bellamkonda, Tolga Bozk...