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SIGMOD
2009
ACM
161views Database» more  SIGMOD 2009»
15 years 11 months ago
Dependency-aware reordering for parallelizing query optimization in multi-core CPUs
The state of the art commercial query optimizers employ cost-based optimization and exploit dynamic programming (DP) to find the optimal query execution plan (QEP) without evalua...
Wook-Shin Han, Jinsoo Lee
SIGMOD
1993
ACM
150views Database» more  SIGMOD 1993»
15 years 8 months ago
Predicate Migration: Optimizing Queries with Expensive Predicates
The traditional focus of relational query optimization schemes has been on the choice of join methods and join orders. Restrictions have typically been handled in query optimizers ...
Joseph M. Hellerstein, Michael Stonebraker
VLDB
1987
ACM
100views Database» more  VLDB 1987»
15 years 8 months ago
Optimization of Systems of Algebraic Equations for Evaluating Datalog Queries
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...
Stefano Ceri, Letizia Tanca
PVLDB
2008
100views more  PVLDB 2008»
15 years 3 months ago
Efficiently approximating query optimizer plan diagrams
Given a parametrized n-dimensional SQL query template and a choice of query optimizer, a plan diagram is a color-coded pictorial enumeration of the execution plan choices of the o...
Atreyee Dey, Sourjya Bhaumik, Harish D., Jayant R....
VLDB
2009
ACM
124views Database» more  VLDB 2009»
16 years 4 months ago
Instance optimal query processing in spatial networks
Ke Deng, Xiaofang Zhou, Heng Tao Shen, Shazia W. S...