Title: Enhanced techniques for timer trigger processing
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Permanent Link: http://ufdc.ufl.edu/UF00101372/00001
 Material Information
Title: Enhanced techniques for timer trigger processing
Physical Description: vii, 73 leaves : ill. ; 29 cm.
Language: English
Creator: Noronha, Lloyd X. 1973- ( Dissertant )
Hanson, Eric ( Thesis advisor )
Hammer, Joachim ( Reviewer )
Su, Stanley Y. W. ( Reviewer )
Publisher: Department of Computer and Information Science and Engineering, University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1999
Copyright Date: 1999
 Subjects
Subjects / Keywords: Computer and Information Science and Engineering thesis, M.S
Database management   ( lcsh )
Dissertations, Academic -- UF -- Computer and Information Science and Engineering
Dissertations, Academic -- UF -- Computer and Information Science and Engineering   ( lcsh )
Genre: bibliography   ( marcgt )
theses   ( marcgt )
 Notes
Abstract: Timer-Driven Triggers allow users to monitor interesting tuples or interesting changes to tuples of a view. Trigger condition testing takes place periodically, i.e., once every few hours, days or weeks. When the timer of a trigger expires, a new copy of the view is retrieved and the trigger predicates applied to that view. Trigger predicates could be transition predicates referring to the attribute values of tuples of a view from the previous timer expiration. Timer Triggers differ from conventional triggers, in that the trigger testing is not done for updated tuples only. Timer triggers could be fired on tuples of a view simply because they satisfy the predicate trigger predicate. Since the trigger conditions are tested every so often, high update rate tables can have a lot of timer triggers defined on them. The goal of this thesis is to design a timer trigger system that works hand-in-hand with a trigger processor and complements its features. The semantics of the timer trigger differ from that of regular triggers and are explained by a brute-force approach. Several enhanced algorithms can be written that do better than the brute-force approach, but do not change the semantics. A timer trigger system also provides the user an option of replacing expensive join and aggregate triggers with timer triggers.
General Note: Printout.
General Note: Vita.
Thesis: Thesis (M.S.)--University of Florida, 1999.
Bibliography: Includes bibliographical references (leaves 70-72).
 Record Information
Bibliographic ID: UF00101372
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 002531467

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