Maintaining temporal consistency of discrete objects in soft real-time database systems

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

22 Scopus Citations
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Detail(s)

Original languageEnglish
Pages (from-to)373-389
Journal / PublicationIEEE Transactions on Computers
Volume52
Issue number3
Publication statusPublished - Mar 2003

Abstract

A real-time database system contains base data items which record and model a physical, real-world environment. For better decision support, base data items are summarized and correlated to derive views. These base data and views are accessed by application transactions to generate the ultimate actions taken by the system. As the environment changes, updates are applied to base data, which subsequently trigger view recomputations. There are thus three types of activities: Base data update, view recomputation, and transaction execution. In a real-time database system, two timing constraints need to be enforced. We require that transactions meet their deadlines (transaction timeliness) and read fresh data (data timeliness). In this paper, we define the concept of absolute and relative temporal consistency from the perspective of transactions for discrete data objects. We address the important issue of transaction scheduling among the three types of activities such that the two timing requirements can be met. We also discuss how a real-time database system should be designed to enforce different levels of temporal consistency.

Research Area(s)

  • Real-time database, Temporal consistency, Transaction scheduling, Updates, View maintenance

Citation Format(s)

Maintaining temporal consistency of discrete objects in soft real-time database systems. / Kao, Ben; Lam, Kam-Yiu; Adelberg, Brad; Cheng, Reynold; Lee, Tony.

In: IEEE Transactions on Computers, Vol. 52, No. 3, 03.2003, p. 373-389.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review