508 search results - page 33 / 102 » Bringing Order to Query Optimization |
PVLDB
2010
13 years 6 months ago
2010
Optimization of join queries based on average selectivities is suboptimal in highly correlated databases. In such databases, relations are naturally divided into partitions, each ...
VLDB
2005
ACM
14 years 1 months ago
2005
ACM
Emerging large-scale monitoring applications require continuous tracking of complex dataanalysis queries over collections of physicallydistributed streams. Effective solutions hav...
PPAM
2005
Springer
14 years 1 months ago
2005
Springer
Abstract. In this paper we deal with the problem of finding an optimal query execution plan in database systems. We improve the analysis of a polynomial-time approximation algorit...
SAC
2009
ACM
14 years 2 months ago
2009
ACM
Today user-centered information acquisition over collections of complex XML documents is increasingly in demand. To this end, preferences have become an important paradigm enablin...
SIGMOD
1996
ACM
13 years 12 months ago
1996
ACM
Magic sets rewriting is a well-known optimization heuristic for complex decision-support queries. There can be many variants of this rewriting even for a single query, which diffe...