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TKDE
2010
218views more  TKDE 2010»
9 years 10 months ago
LIGHT: A Query-Efficient Yet Low-Maintenance Indexing Scheme over DHTs
DHT is a widely used building block for scalable P2P systems. However, as uniform hashing employed in DHTs destroys data locality, it is not a trivial task to support complex queri...
Yuzhe Tang, Shuigeng Zhou, Jianliang Xu
PVLDB
2010
134views more  PVLDB 2010»
10 years 2 months ago
Conditioning and Aggregating Uncertain Data Streams: Going Beyond Expectations
Uncertain data streams are increasingly common in real-world deployments and monitoring applications require the evaluation of complex queries on such streams. In this paper, we c...
Thanh T. L. Tran, Andrew McGregor, Yanlei Diao, Li...
VLDB
2002
ACM
161views Database» more  VLDB 2002»
10 years 3 months ago
BANKS: Browsing and Keyword Searching in Relational Databases
The BANKS system enables keyword-based search on databases, together with data and schema browsing. BANKS enables users to extract information in a simple manner without any knowl...
B. Aditya, Gaurav Bhalotia, Soumen Chakrabarti, Ar...
CORR
1999
Springer
116views Education» more  CORR 1999»
10 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...
BMCBI
2008
121views more  BMCBI 2008»
10 years 4 months ago
OntoDas - a tool for facilitating the construction of complex queries to the Gene Ontology
Background: Ontologies such as the Gene Ontology can enable the construction of complex queries over biological information in a conceptual way, however existing systems to do thi...
Kieran O'Neill, Alexander García Castro, An...
DMDW
2000
161views Management» more  DMDW 2000»
10 years 5 months ago
View materialization for nested GPSJ queries
View materialization is a central issue in logical design of data warehouses since it is one of the most powerful techniques to improve the response to the workload. Most approach...
Matteo Golfarelli, Stefano Rizzi
KR
2010
Springer
10 years 8 months ago
Improving Query Answering over DL-Lite Ontologies
The DL-Lite family of Description Logics has been designed with the specific goal of allowing for answering complex queries (in particular, conjunctive queries) over ontologies w...
Riccardo Rosati, Alessandro Almatelli
ADC
1994
Springer
103views Database» more  ADC 1994»
10 years 8 months ago
A Query Language for EER Schemas
We present a proposed query language for extended entity relationship schemas. The language improves on previous proposals by using only concepts explicitly in a given schema. It ...
Michael Lawley, Rodney W. Topor
GRID
2003
Springer
10 years 9 months ago
Scoped and Approximate Queries in a Relational Grid Information Service
We are developing a grid information service, RGIS, that is based on the relational data model. RGIS supports complex queries written in SQL that search for compositions (using jo...
Dong Lu, Peter A. Dinda, Jason A. Skicewicz
DEXA
2003
Springer
108views Database» more  DEXA 2003»
10 years 9 months ago
Exploiting Similarity of Subqueries for Complex Query Optimization
Query optimizers in current database management systems (DBMS) often face problems such as intolerably long optimization time and/or poor optimization results when optimizing compl...
Yingying Tao, Qiang Zhu, Calisto Zuzarte
books