115 search results - page 18 / 23 » Predicate Migration: Optimizing Queries with Expensive Predi... |
PODS
1999
ACM
13 years 11 months ago
1999
ACM
One of the most important types of query processing in spatial databases and geographic information systems is the spatial join, an operation that selects, from two relations, all...
VLDB
2004
ACM
14 years 21 days ago
2004
ACM
When query optimizers erroneously assume that database columns are statistically independent, they can underestimate the selectivities of conjunctive predicates by orders of magni...
SAS
2001
Springer
13 years 11 months ago
2001
Springer
We present the implementation of cTI, a system for universal left-termination inference of logic programs, which heavily relies on static analysis techniques. Termination inference...
SIGMOD
2007
ACM
14 years 7 months ago
2007
ACM
An emerging challenge in modern distributed querying is to efficiently process multiple continuous aggregation queries simultaneously. Processing each query independently may be i...
EDBT
2002
ACM
14 years 7 months ago
2002
ACM
Abstract. Estimating the sizes of query results, and intermediate results, is crucial to many aspects of query processing. In particular, it is necessary for effective query optimi...