Query evaluation techniques for large databases
ACM Computing Surveys (CSUR)
WSQ/DSQ: a practical approach for combined querying of databases and the Web
SIGMOD '00 Proceedings of the 2000 ACM SIGMOD international conference on Management of data
Extending OLAP querying to external object databases
Proceedings of the ninth international conference on Information and knowledge management
Cost Modeling and Estimation for OLAP-XML Federations
DaWaK 2000 Proceedings of the 4th International Conference on Data Warehousing and Knowledge Discovery
Summarizability in OLAP and Statistical Data Bases
SSDBM '97 Proceedings of the Ninth International Conference on Scientific and Statistical Database Management
SSDBM '02 Proceedings of the 14th International Conference on Scientific and Statistical Database Management
OLAP++: Powerful and Easy-to-Use Federations of OLAP and Object Databases
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
The Volcano Optimizer Generator: Extensibility and Efficient Search
Proceedings of the Ninth International Conference on Data Engineering
Integrating XML Data in the TARGITOLAP System
ICDE '04 Proceedings of the 20th International Conference on Data Engineering
Warehousing the world: a few remaining challenges
Proceedings of the ACM tenth international workshop on Data warehousing and OLAP
Two approaches to the integration of heterogeneous data warehouses
Distributed and Parallel Databases
Integrating XML data in the TARGIT OLAP system
International Journal of Web Engineering and Technology
Concurrent Operations for Accessing an XML Document in a Multi-user Environment
ICA3PP '09 Proceedings of the 9th International Conference on Algorithms and Architectures for Parallel Processing
What can hierarchies do for data streams?
BIRTE'06 Proceedings of the 1st international conference on Business intelligence for the real-time enterprises
A conceptual model for multidimensional analysis of documents
ER'07 Proceedings of the 26th international conference on Conceptual modeling
Finding an application-appropriate model for XML data warehouses
Information Systems
Design and development of a tool for integrating heterogeneous data warehouses
DaWaK'05 Proceedings of the 7th international conference on Data Warehousing and Knowledge Discovery
A practical application of our MDD approach for modeling secure XML data warehouses
Decision Support Systems
On the need of a reference algebra for OLAP
DaWaK'07 Proceedings of the 9th international conference on Data Warehousing and Knowledge Discovery
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In today's OLAP systems, integrating fast changing data, e.g., stock quotes, physically into a cube is complex and time consuming. The widespread use of XML makes it very possible that this data is available in XML format on the WWW. Thus, making XML data logically federated with OLAP systems is desirable. In this paper, we extend previous work on the logical federation of OLAP and XML data sources by presenting a simplified query semantics, a physical query algebra and a robust OLAP-XML query engine. Performance experiments with a prototypical implementation suggest that the performance for OLAP-XML federations is comparable to queries on physically integrated data.