Object-oriented multidatabase systems
Object management architecture guide (3rd ed.)
Object management architecture guide (3rd ed.)
The TSIMMIS Approach to Mediation: Data Models and Languages
Journal of Intelligent Information Systems - Special issue: next generation information technologies and systems
An Adaptive Object-Oriented Approach to Integration and Access ofHeterogeneous Information Sources
Distributed and Parallel Databases
Efficient mid-query re-optimization of sub-optimal query execution plans
SIGMOD '98 Proceedings of the 1998 ACM SIGMOD international conference on Management of data
Cost-based query scrambling for initial delays
SIGMOD '98 Proceedings of the 1998 ACM SIGMOD international conference on Management of data
Principles of distributed database systems (2nd ed.)
Principles of distributed database systems (2nd ed.)
Functional Query Optimization over Object-Oriented Views for Data Integration
Journal of Intelligent Information Systems - Special issue on functional approach to intelligent information systems
Eddies: continuously adaptive query processing
SIGMOD '00 Proceedings of the 2000 ACM SIGMOD international conference on Management of data
Scaling Access to Heterogeneous Data Sources with DISCO
IEEE Transactions on Knowledge and Data Engineering
Optimizing Queries Across Diverse Data Sources
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Integrating Heterogenous Overlapping Databases through Object-Oriented Transformations
VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
LEO - DB2's LEarning Optimizer
Proceedings of the 27th International Conference on Very Large Data Bases
Distributed View Expansion in Composable Mediators
CooplS '02 Proceedings of the 7th International Conference on Cooperative Information Systems
Query processing over object views of relational data
The VLDB Journal — The International Journal on Very Large Data Bases
ObjectGlobe: Ubiquitous query processing on the Internet
The VLDB Journal — The International Journal on Very Large Data Bases
Optimizing Queries in Distributed and Composable Mediators
COOPIS '99 Proceedings of the Fourth IECIS International Conference on Cooperative Information Systems
DiscoveryLink: a system for integrated access to life sciences data sources
IBM Systems Journal - Deep computing for the life sciences
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Integration of multiple heterogeneous sources is crucial for efficient sharing and reuse of distributed data. An architecture for scalable data integration of many autonomous data sources is presented. In the architecture peer-to-peer (P2P) mediators can be defined in terms of each other through object-oriented (OO) views. Query processing with scalable performance is important to make such an architecture useful in practice. The focus of the described doctoral thesis is on query processing techniques in a composable P2P mediator architecture. Through distributed selective view expansion mediator peers are treated as 'greyboxes' with varying level of transparency. This allows to balance between compilation time and query execution plan (QEP) quality for good overall performance. Self-profiling integrated with the query processor allows for the implementation of adaptive query processing techniques. Adaptive rebalancing of distributed QEPs based on the self-profiling capability of the optimizer detects and re-optimizes sub-optimal QEPs. The proposed P2P mediator architecture and some of the query processing techniques are implemented in the AMOS II mediator system.