620 search results - page 18 / 124 » Algorithms for Rewriting Aggregate Queries Using Views |
120
Voted
SIGMOD
2011
ACM
14 years 5 months ago
2011
ACM
We study the problem of context-sensitive ranking for document retrieval, where a context is defined as a sub-collection of documents, and is specified by queries provided by do...
120
Voted
SIGMOD
2004
ACM
16 years 2 months ago
2004
ACM
Current day database applications, with large numbers of users, require fine-grained access control mechanisms, at the level of individual tuples, not just entire relations/views,...
134
Voted
VLDB
1999
ACM
15 years 6 months ago
1999
ACM
On-Line Analytical Processing (OLAP) based on a dimensional view of data is being used increasingly for the purpose of analyzing very large amounts of data. To improve query perfo...
125
Voted
VLDB
1999
ACM
15 years 6 months ago
1999
ACM
We present an optimization method and algorithm designed for three objectives: physical data independence, semantic optimization, and generalized tableau minimization. The method ...
125
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SIGMOD
1996
ACM
15 years 6 months ago
1996
ACM
Decision support applications involve complex queries on very large databases. Since response times should be small, query optimization is critical. Users typically view the data ...