53 search results - page 3 / 11 » Optimizing joins in a map-reduce environment |
DOLAP
2005
ACM
13 years 9 months ago
2005
ACM
Materialized views are nowadays commonly used in the data warehouse environment. Materialized views need to be updated when data sources change. Since the update of the views may ...
ICDT
1999
ACM
13 years 11 months ago
1999
ACM
In data integration systems, queries posed to a mediator need to be translated into a sequence of queries to the underlying data sources. In a heterogeneous environment, with sour...
PVLDB
2010
13 years 5 months ago
2010
To enable smart environments and self-tuning data centers, we are developing the Aspen system for integrating physical sensor data, as well as stream data coming from machine logi...
ICDE
2005
IEEE
14 years 8 months ago
2005
IEEE
Maintaining materialized views that have join conditions between arbitrary pairs of data sources possibly with cycles is critical for many applications. In this work, we model vie...
SIGMOD
1999
ACM
13 years 11 months ago
1999
ACM
In large data warehousing environments, it is often advantageous to provide fast, approximate answers to complex aggregate queries based on statistical summaries of the full data....