Encyclopedia of Database Systems

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

Replication for Availability and Fault Tolerance

Living reference work entry
DOI: https://doi.org/10.1007/978-1-4899-7993-3_80723-1

Synonyms

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 2017

Authors and Affiliations

  1. 1.School of Computer ScienceMcGill UniversityMontrealCanada

Section editors and affiliations

  • Bettina Kemme
    • 1
  1. 1.School of Computer Science, McGill UniversityMontrealCanada