167 search results - page 17 / 34 » Optimization of Query Plans in the presence of Access Limita... |
ICDE
2005
IEEE
14 years 1 months ago
2005
IEEE
Current federated systems deploy cost-based query optimization mechanisms; i.e., the optimizer selects a global query plan with the lowest cost to execute. Thus, cost functions in...
VLDB
2001
ACM
14 years 8 months ago
2001
ACM
The problem of answering queries using views is to find efficient methods of answering a query using a set of previously materialized views over the database, rather than accessing...
BTW
2003
Springer
14 years 27 days ago
2003
Springer
Abstract: In order to achieve efficient execution plans for queries comprising userdefined data types and predicates, the database system has to be provided with appropriate index ...
VLDB
1991
ACM
13 years 11 months ago
1991
ACM
Queries in object-oriented datab;Lqcs are formulated against a class and retrieve instnnccls of the class sat,isfying a certain predicate on the att,riblltes of the class. The pre...
VLDB
2005
ACM
14 years 1 months ago
2005
ACM
XML and XQuery semantics are very sensitive to the order of the produced output. Although pattern-tree based algebraic approaches are becoming more and more popular for evaluating...