• Publications
  • Influence
Towards Sensor Database Systems
TLDR
This paper defines the concept of sensor databases mixing stored data represented as relations and sensorData represented as time series, and describes the design and implementation of the COUGAR sensor database system.
Querying the physical world
TLDR
An abstraction is defined that allows to represent a device network as a database and how distributed query processing techniques are applied in this new context of a device database system is described.
SEQ: A model for sequence databases
TLDR
The SEQ model separates the data from the ordering information, and includes operators based on two distinct abstractions of a sequence, which supports an expressive range of sequence queries.
Least expected cost query optimization: an exercise in utility
TLDR
This work identifies two unreasonable, though standard, assumptions made by database query optimizers that can adversely affect the quality of the chosen evaluation plans and presents an algorithm based on the ``System R''-style query optimization algorithm that does not rely on these assumptions.
The Design and Implementation of a Sequence Database System
TLDR
The issues that were addressed when building the SEQ sequence database system, a database system with support for sequence data, are described and a novel nested design paradigm used in PREDATOR to combine sequence ‘and relational data is presented.
Complex query decorrelation
TLDR
An efficient and flexible algorithm called magic decorrelation is presented which is superior to existing algorithms both in terms of the generality of application, and the efficiency of the rewritten query.
Coral++: Adding Object-Orientation to a Logic Database Language
TLDR
The implementation outline illustrates that extending an existing deductive system to incorporate object-oriented features in the data model is feasible, and is orthogonal to the techniques used for object storage and retrieval.
The CORAL deductive system
TLDR
A comprehensive view of the CORAL system is presented, from broad design goals, the language, and the architecture, to language interfaces and implementation details.
PREDATOR: a resource for database research
TLDR
Several features of the PREDATOR object-relational database system should make it attractive for database research and education.
Sequence query processing
TLDR
This work presents a bottom-up algorithm that generates an efficient query evaluation plan based on cost estimates, and identifies a number of directions in which future research can be directed.
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