304 search results - page 55 / 61 » Selectivity Estimation of Window Queries |
EDBT
2006
ACM
14 years 7 months ago
2006
ACM
Given a set of N multi-dimensional points, we study the computation of -quantiles according to a ranking function F, which is provided by the user at runtime. Specifically, F compu...
AP2PC
2003
Springer
14 years 28 days ago
2003
Springer
The objective of query optimizers is to select a good execution plan for a given query. In a distributed system, it is crucial for a query optimizer to have effective remote cost e...
GECCO
2004
Springer
14 years 1 months ago
2004
Springer
Portable embedded systems are being driven by consumer demands to be thermally efficient, perform faster, and have longer battery life. To design such a system, various hardware un...
PODS
1999
ACM
14 years 19 hour ago
1999
ACM
Query optimizers rely on fast, high-quality estimates of result sizes in order to select between various join plans. Selfjoin sizes of relations provide bounds on the join size of...
ICDE
2010
IEEE
14 years 7 months ago
2010
IEEE
Decision support queries that scan large indexes can suffer significant degradation in I/O performance due to index fragmentation. DBAs rely on rules of thumb that use index size a...