6650 search results - page 1081 / 1330 » Mutating database queries |
142
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CCS
2007
ACM
15 years 10 months 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 ...
115
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PODS
2010
ACM
15 years 9 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...
136
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IDEAS
1999
IEEE
15 years 8 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...
178
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PODS
1994
ACM
15 years 8 months ago
1994
ACM
Traditionally, computational complexity has considered only static problems. Classical Complexity Classes such as NC, P, and NP are de ned in terms of the complexity of checking {...
157
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ACL
1989
15 years 5 months ago
1989
Comparative expressions (CEs) such as "bigger than" and "more oranges than" are highly ambiguous, and their meaning is context dependent. Thus, they pose probl...