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Multiversion concurrency control scheme for a distributed database system — A trial to break concurrent update of redundant copies —

  • Shojiro Muro
  • Tadashi Mizutani
  • Toshiharu Hasegawa
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 220)

Abstract

A new multiversion concurrency control scheme for a distributed database system is proposed in this paper. Each data object in our database model has two copies allocated in different sites in the system. Unlike the usual distributed database systems with redundant copies, these two copies are not concurrently updated, but only one is updated for a write request. For each data object, the copy with a newly updated value is called the new version and the other is called the old version. Since two versions are accessible for each read request to an object and concurrent update of two copies of each data object is not necessary, our scheme allows increased concurrency. Our concurrency control scheme employs both timestamp mechanism and locking mechanism with two different modes which is based on the (r,a,c)-locking protocol proposed by Bayer et al., and it grants a version for every read request without causing inconsistency. Transactions with write requests which would cause inconsistency are aborted. It has been proven that our concurrency control scheme works correctly; namely, it preserves consistency without deadlock or livelock among operations of the transactions in the system.

Keywords

Concurrency Control Read Operation Local Controller Transaction Manager Home Site 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • Shojiro Muro
    • 1
  • Tadashi Mizutani
    • 2
  • Toshiharu Hasegawa
    • 1
  1. 1.Department of Applied Mathematics and Physics Faculty of EngineeringKyoto UniversityKyotoJapan
  2. 2.Fujisawa Development Laboratory-IBM JapanFujisawa, KanagawaJapan

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