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Data Replication

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Encyclopedia of Database Systems

Synonyms

Database replication; Replication

Definition

Using data replication, each logical data item of a database has several physical copies, each of them located on a different machine, also referred to as site or node. Depending on the context and the type of replication architecture, the term replica can refer to one of the physical copies of a particular data item, or to an entire site with all its data copies. Data replication can serve different purposes. First, it can be used to increase availability and provide fault-tolerance since the data can, in principle, be accessed as long as one replica is available. Second, it can provide good performance. By storing replicas close to users that want to access the data, replication allows fast local access. Third, access requests can be distributed across the replicas. By adding more replicas to the system a higher incoming workload can be handled, and hence, a higher throughput can be achieved. Thus, replication is a means to...

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Recommended Reading

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Author information

Authors and Affiliations

  1. McGill University, Montreal, QC, Canada

    Bettina Kemme

Authors
  1. Bettina Kemme
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Kemme, B. (2009). Data Replication. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_110

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