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For a number of reasons, even the best query optimizers can very often produce sub-optimal query execution plans, leading to a significant degradation of performance. This is especially true in databases used for complex decision support queries and/or object-relational databases. In this paper, we describe an algorithm that detects sub-optimality of a(More)
This paper presents a number of new techniques for parallelizing geo-spatial database systems and discusses their implementation in the Paradise object-relational database system. The effectiveness of these techniques is demonstrated using a variety of complex geo-spatial queries over a 120 GB global geo-spatial data set.
In this paper we describe the design and implementation of OPT++, a tool for Extensible Database Query Optimization that uses an object-oriented design to simplify the task of implementing, extending, and modifying an optimizer. Building an optimizer using OPT++ makes it easy to extend the query algebra (to add new query algebra operators and physical(More)
We present an overview of a novel customer support system developed at QUIQ between 1999 and 2003. The application was perhaps the first systematic use of mass collaboration , which builds on the observation that large communities of users can be effectively leveraged to help each other, and to advance the interests of the community as a whole. In recent(More)
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