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CORR
1999
Springer
116views Education» more  CORR 1999»
13 years 3 months ago
Efficient and Extensible Algorithms for Multi Query Optimization
Complex queries are becoming commonplace, with the growing use of decision support systems. These complex queries often have a lot of common sub-expressions, either within a singl...
Prasan Roy, S. Seshadri, S. Sudarshan, Siddhesh Bh...
ICDE
2010
IEEE
562views Database» more  ICDE 2010»
14 years 3 months ago
Multi-Guarded Safe Zone: An Effective Technique to Monitor Moving Circular Range Queries
Given a positive value r, a circular range query returns the objects that lie within the distance r of the query location. In this paper, we study the circular range queries that c...
Muhammad Aamir Cheema, Ljiljana Brankovic, Xuemin ...
SIGMOD
2001
ACM
120views Database» more  SIGMOD 2001»
14 years 3 months ago
Materialized View Selection and Maintenance Using Multi-Query Optimization
Materialized views have been found to be very effective at speeding up queries, and are increasingly being supported by commercial databases and data warehouse systems. However, w...
Hoshi Mistry, Prasan Roy, S. Sudarshan, Krithi Ram...
DAWAK
2001
Springer
13 years 8 months ago
Optimization Algorithms for Simultaneous Multidimensional Queries in OLAP Environments
Multi-Dimensional Expressions (MDX) provide an interface for asking several related OLAP queries simultaneously. An interesting problem is how to optimize the execution of an MDX q...
Panos Kalnis, Dimitris Papadias
PVLDB
2008
136views more  PVLDB 2008»
13 years 3 months ago
Keyword query cleaning
Unlike traditional database queries, keyword queries do not adhere to predefined syntax and are often dirty with irrelevant words from natural languages. This makes accurate and e...
Ken Q. Pu, Xiaohui Yu