Institute for Systems Research Technical Reports

Permanent URI for this collectionhttp://hdl.handle.net/1903/4376

This archive contains a collection of reports generated by the faculty and students of the Institute for Systems Research (ISR), a permanent, interdisciplinary research unit in the A. James Clark School of Engineering at the University of Maryland. ISR-based projects are conducted through partnerships with industry and government, bringing together faculty and students from multiple academic departments and colleges across the university.

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Author: search.filters.author.Cochrane, Roberta J.Subject: search.filters.subject.expert systems

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    Update Dependencies in the Relational Model
    (1991) Mark, Leo; Roussopoulos, N.; Cochrane, Roberta J.; ISR
    Relational database systems suffer from the lack of a rich update language. In this paper we present the Update Dependency Language which allows the database designer to specify a procedure for each update that is activated when attempts are made to perform the update. Each procedure integrates the update dependencies for an update and provides an operational semantics for the update which is maintained by the system. We provide a formal definition for this language, illustrate its use, and discuss concurrency control issues related to integrating such a language into a database system.
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    Implementing Set-Oriented Production Rules as an Extension to Starburst
    (1991) Widom, J.; Lindsay, Bruce G.; Cochrane, Roberta J.; ISR
    This paper describes the implementation of a set-oriented database production rule language proposed in earlier papers. Our implementation uses the extensibility features of the Starburst database system, and rule execution is fully integrated into database query and transaction processing.