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Encyclopedia of Database Systems pp 2135–2136Cite as

Logging/Recovery Subsystem

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Synonyms

Audit trail; Log component; Log manager; Recovery manager

Definition

The logging/recovery subsystem (LRS) of a DBMS is responsible for implementing the fault tolerance mechanisms needed to support database transactions. The log component stores the information needed to undo the updates performed by a transaction in case it has to be rolled back, either to an internal save point or to the beginning. It also stores information needed to re-apply the updates of committed transactions to the database in case they are (partially) lost due to a system crash or after a storage media failure. In addition, the log component keeps track of all relevant state transitions such as begin-transaction, prepare, commit, abort, checkpoint, etc. The log is the first resource that is activated when restarting the database after a crash [1]. The recovery component orchestrates the activities needed to repair the database, depending on the situation. For example, after a crash, it first locates...

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Recommended Reading

  1. Gray J, Reuter A. Transaction processing – concepts and techniques. San Mateo: Morgan Kaufmann; 1993.

    MATH  Google Scholar 

  2. Härder T, Reuter A. Principles of transaction oriented database recovery – a taxonomy. ACM Comput Surv. 1983;15(4):287–317.

    Article  Google Scholar 

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Author information

Authors and Affiliations

  1. Heidelberg Laureate Forum Foundation, Schloss-Wolfsbrunnenweg 33, Heidelberg, Germany

    Andreas Reuter

Authors
  1. Andreas Reuter
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Corresponding author

Correspondence to Andreas Reuter .

Editor information

Editors and Affiliations

  1. Georgia Institute of Technology College of Computing, Atlanta, GA, USA

    Ling Liu

  2. University of Waterloo School of Computer Science, Waterloo, ON, Canada

    M. Tamer Özsu

Section Editor information

  1. Informatique et Communications, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

    Anastasia Ailamaki

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

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Cite this entry

Reuter, A. (2018). Logging/Recovery Subsystem. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_680

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