Achieving bounded and predictable recovery using real-time logging

Lih Chyun Shu, John A. Stankovic, Sang H. Son

Research output: Contribution to journalConference article

7 Citations (Scopus)

Abstract

Real-time databases are increasingly being used as an integral part of many computer systems. During normal operation, transactions in real-time databases must be executed in such a way that transaction timing and data time validity constraints can be met. Real-time databases must also prepare for possible failures and provide fault tolerance capability. Principles for fault tolerance in real-time databases must take timing requirements into consideration and are distinct from those for conventional databases. We discuss these issues in this paper and describe a logging and recovery technique that is time-cognizant and is suitable for an important class of real-time database applications. The technique minimizes normal runtime overhead caused by logging and has a predictable impact on transaction timing constraints. Upon a failure, the system can recover critical data to a consistent and temporally valid state within predictable time bounds. The system can then resume its major functioning, while non-critical data is being recovered in the background. As a result, the recovery time is bounded and shortened. Our performance evaluation via simulation shows that logging overhead has a small effect on missing transaction deadlines while adding recovery capability. Experiments also show that recovery using our approach is 3 to 6 times faster than traditional recovery.

Original languageEnglish
Article number1137404
Pages (from-to)286-297
Number of pages12
JournalReal-Time Technology and Applications - Proceedings
DOIs
Publication statusPublished - 2002 Dec 1
Event8th IEEE Real-Time and Embedded Technology and Applications Symposium, RTAS 2002 - San Jose, CA, United States
Duration: 2002 Sep 252002 Sep 27

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All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Hardware and Architecture
  • Software

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