Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Two-Phase Commit Protocol

  • Jens LechtenbörgerEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_2


XA standard


The two-phase commit (2PC) protocol is a distributed algorithm to ensure the consistent termination of a transaction in a distributed environment. Thus, via 2PC a unanimous decision is reached and enforced among multiple participating servers whether to commit or abort a given transaction, thereby guaranteeing atomicity. The protocol proceeds in two phases, namely, the prepare (or voting) and the commit (or decision) phase, which explains the protocol’s name.

The protocol is executed by a coordinator process, while the participating servers are called participants. When the transaction’s initiator issues a request to commit the transaction, the coordinator starts the first phase of the 2PC protocol by querying – via prepare messages – all participants whether to abort or to commit the transaction. If all participants vote to commit, then in the second phase, the coordinator informs all participants to commit their share of the transaction by sending a com...

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Copyright information

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

Authors and Affiliations

  1. 1.University of MünsterMünsterGermany

Section editors and affiliations

  • Gottfried Vossen
    • 1
  1. 1.Dep. of Inf. SystemsWestf. Wilhelms-UniveristätMünsterGermany