Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Replication for Availability and Fault Tolerance

  • Bettina Kemme
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_80723

Synonyms

Backup mechanisms; Fault-tolerance

Definition

Replication is a common mechanism to increase the availability of a data service. The idea is to have several copies of the database, each of them installed on a different site (machine or set of machines). Using replication, the data remains available as long as one site is running and accessible. Fault tolerance is related to availability, and the two terms are often used interchangeably. A system is considered fault tolerant if it continues to work correctly despite the failure of individual components. Replicating data and processes over several sites, the failure of any individual site can be masked since the tasks executed by the failed site can be transferred to one of the available sites. In its strict definition, a fault-tolerant system must behave exactly as a system where components never fail. This requires making failures transparent to clients and typically means that all data copies have to be consistent at all...

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Computer ScienceMcGill UniversityMontrealCanada