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Query optimization is the most important and complex phase of answering a user query. While sufficient for some applications, the widely used type of relational optimizers are not always robust, picking execution plans that are far from optimal. This is due to several reasons. First, they depend on
This thesis considers concept-based multimedia retrieval, where documents are represented by the occurrence of concepts (also referred to as semantic concepts or high-level features). A concept can be thought of as a kind of label, which is attached to (parts of) the multimedia documents in which it
Service-providers collect more and more privacy-sensitive information, even though it is hard to protect this information against hackers, abuse of weak privacy policies, negligence, and malicious database administrators. In this thesis, we take the position that endless retention of privacy-sensiti
The anticipated ‘sensing environments’ of the near future pose new requirements to the data management systems that mediate between sensor data supply and demand sides. We identify and investigate one of them: the need to deal with the inherent uncertainty in sensor data due to measurement noise, mi
In this thesis we have developed a verification theory and a tool for the automated analysis of assertions about object-oriented database schemas. The approach is inspired by the work of [SS89] in which a theorem prover is used to automate the verification of invariants for transactions on a relatio
Despite the rapid progress of the previous decades, information system engineering is still not as mature as many other engineering disciplines like electronics. A prominent aspect in which this can be observed is the toolset an engineer has to his disposal for design and development. For example, a
Information systems are being used for more and more applications, are becoming more complicated and expensive, while at the same time affecting large parts of our society. It is therefore important that information systems are developed in an effective and efficient way. To achieve this, numerous m
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