651 search results - page 52 / 131 » Algebraic Query Optimization for Distributed Top-k Queries |
PODS
2003
ACM
14 years 9 months ago
2003
ACM
In this paper we study the following problem. Given a database and a set of queries, we want to find, in advance, a set of views that can compute the answers to the queries, such ...
COOPIS
2003
IEEE
14 years 2 months ago
2003
IEEE
The use of semantic knowledge in its various forms has become an important aspect in managing data in database and information systems. In the form of integrity constraints, it ha...
EDBT
2008
ACM
14 years 9 months ago
2008
ACM
Many systems such as Tukwila and YFilter combine automaton and algebra techniques to process queries over tokenized XML streams. Typically in this architecture, an automaton is fi...
DEBS
2011
ACM
2011
ACM
DejaVu: a complex event processing system for pattern matching over live and historical data streams
13 years 17 days ago
This short paper provides an overview of the DejaVu complex event processing (CEP) system, with an emphasis on its novel architecture and query optimization techniques for correla...
KRDB
1997
13 years 10 months ago
1997
A data warehouse is a redundant collection of data replicated from several possibly distributed and loosely coupled source databases, organized to answer OLAP queries. Relational ...