217 search results - page 19 / 44 » An optimization for query answering on ALC database |
SIGMOD
2004
ACM
14 years 7 months ago
2004
ACM
We present the Priority R-tree, or PR-tree, which is the first R-tree variant that always answers a window query using O((N/B)1-1/d + T/B) I/Os, where N is the number of ddimensio...
OTM
2005
Springer
14 years 29 days ago
2005
Springer
Abstract. Caching can highly improve performance of query processing in distributed databases. In this paper we show how this technique can be used in grid architecture where data ...
SIGMOD
2011
ACM
12 years 10 months ago
2011
ACM
In this paper we consider the problem of answering queries using views, which is important for data integration, query optimization, and data warehouses. We consider its simplest ...
VLDB
2005
ACM
14 years 29 days ago
2005
ACM
The interaction between recursion in XPATH and recursion in DTDs makes it challenging to answer XPATH queries on XML data that is stored in an RDBMS via schema-based shredding. We...
ICDE
2006
IEEE
14 years 1 months ago
2006
IEEE
The window query model is widely used in data stream management systems where the focus of a continuous query is limited to a set of the most recent tuples. In this dissertation, ...