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Logging/Recovery Subsystem

  • Reference work entry
Encyclopedia of Database Systems

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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. and Reuter A. Transaction Processing – Concepts and Techniques. Morgan Kaufmann, San Mateo, CA, 1993.

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

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Author information

Authors and Affiliations

  1. EML Research gGmbH Villa Bosch, Heidelberg, Germany,  ,  

    Andreas Reuter

Authors
  1. Andreas Reuter
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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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Reuter, A. (2009). Logging/Recovery Subsystem. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_680

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