151 search results - page 13 / 31 » Materializing views with minimal size to answer queries |
VLDB
2001
ACM
15 years 4 months ago
2001
ACM
In this paper we focus on the following problem in information management: given a large collection of recorded information and some knowledge of the process that is generating th...
DAWAK
1999
Springer
15 years 4 months ago
1999
Springer
A Data Warehouse DW can be abstractly seen as a set of materialized views de ned over relations that are stored in distributed heterogeneous databases. The selection of views for...
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SIGMOD
2004
ACM
15 years 11 months ago
2004
ACM
The prevalent use of XML highlights the need for a generic, flexible access-control mechanism for XML documents that supports efficient and secure query access, without revealing ...
VLDB
2001
ACM
15 years 4 months ago
2001
ACM
Estimating the number of distinct values is a wellstudied problem, due to its frequent occurrence in queries and its importance in selecting good query plans. Previous work has sh...
SIGMOD
1997
ACM
15 years 3 months ago
1997
ACM
Data warehouses store materialized views over base data from external sources. Clients typically perform complex read-only queries on the views. The views are refreshed periodical...