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- Hansson, Jörgen,1970-Linköpings universitet,Institutionen för datavetenskap,Tekniska högskolan (author)
Value-driven multi-class overload management in real-time database systems
- BookEnglish1999
Publisher, publication year, extent ...
- Linköping :Linköpings universitet,1999
- 171 s.
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:liu-35742
- ISBN:9172195428
- https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-35742URI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
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Series
- Linköping Studies in Science and Technology. Dissertations,0345-7524 ;595
Notes
- In complex real-time applications, real-time systems handle significant amounts of information that must be managed efficiently, motivating the need for incorporating real-time database management into real-time systems. However, resource management in real-time database systems is a complex issue. Since these systems often operate in environments of imminent and transient overloads, efficient overload handling is crucial to the performance of a real-time database system.In this thesis, we focus on dynamic overload management in real-time database systems. The multi-class workload consists of transaction classes having critical transactions with contingency transactions and non-critical transactions. Non-critical transaction classes may have additional requirements specifying the minimum acceptable completion ratios that should be met in order to maintain system correctness. We propose a framework which has been implemented and evaluated for resolving transient overloads in such workloads.The contributions of our work are fourfold as the framework consists of (i) a new scheduling architecture and (ii) a strategy for resolving transient overloads by re-allocating resources, (iii) a value-driven overload management algorithm (OR-ULD) that supports the strategy, running in O(n log n) time (where n is the number of transactions), and (iv) a bias control mechanism (OR-ULD/BC). The performance of OR-ULD and OR-ULD/BC is evaluated by extensive simulations. Results show that, within a specified operational envelope, OR-ULD enforces critical time constraints for multi-class transaction workloads and OR-ULD/BC further enforces minimum class completion ratio requirements.
Subject headings and genre
- NATURVETENSKAP Data- och informationsvetenskap Datavetenskap hsv//swe
- NATURAL SCIENCES Computer and Information Sciences Computer Sciences hsv//eng
- Computer science
- Datavetenskap
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- Linköpings universitetInstitutionen för datavetenskap (creator_code:org_t)
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