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VLDB
2005
ACM
14 years 2 months ago
2005
ACM
Cost-based query optimizers need to estimate the selectivity of conjunctive predicates when comparing alternative query execution plans. To this end, advanced optimizers use multi...
VLDB
2005
ACM
14 years 2 months ago
2005
ACM
Developing cost models for query optimization is significantly harder for XML queries than for traditional relational queries. The reason is that XML query operators are much mor...
ACMDIS
2004
ACM
14 years 2 months ago
2004
ACM
The success of translating an analog or manual practice into a digital interactive system may depend on how well that translation captures not only the functional what and how asp...
PODC
2004
ACM
14 years 2 months ago
2004
ACM
We present a low-cost, decentralized algorithm for ID management in distributed hash tables (DHTs) managed by a dynamic set of hosts. Each host is assigned an ID in the unit inter...
ADBIS
2004
Springer
14 years 2 months ago
2004
Springer
Abstract. Query reformulation techniques based on semantic knowledge have been used in two ways in database management systems, namely for query optimization and for data integrati...