7576 search results - page 1264 / 1516 » On Querying Ontologies and Databases |
286
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ICDE
2006
IEEE
16 years 8 months ago
2006
IEEE
Counting in general, and estimating the cardinality of (multi-) sets in particular, is highly desirable for a large variety of applications, representing a foundational block for ...
280
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SIGMOD
2007
ACM
16 years 6 months ago
2007
ACM
Querying XML effectively and efficiently using declarative languages such as XQuery and XPath has been widely studied in both academic and industrial settings. Most RDBMS vendors ...
177
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CCS
2007
ACM
16 years 25 days ago
2007
ACM
In this paper, we study the maintenance of role-based access control (RBAC) models in database environments using transitive closure relations. In particular, the algorithms that ...
143
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PODS
2010
ACM
15 years 11 months ago
2010
ACM
A fundamental problem in data management is to draw a sample of a large data set, for approximate query answering, selectivity estimation, and query planning. With large, streamin...
178
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IDEAS
1999
IEEE
15 years 11 months ago
1999
IEEE
An object database management system (OODBMS) has been often criticized for its alleged insufficient scalability for a large-scale production system. We investigated the scalabili...