Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An atomic commit is an operation in which a set of distinct changes is applied as a single operation. If the changes are applied then the atomic commit is said to have succeeded. If there is a failure before the atomic commit can be completed then all of the changes completed in the atomic commit are reversed. This insures that the system is always left in a consistent state. The other key property of isolation comes from their nature as atomic operations. Isolation insures that only one atomic commit is processed at a time. The most common uses of atomic commits are in database system and revision control system systems. The problem with atomic commits is that they require coordination between multiple systems. As computer networks are unreliable services this means no algorithm can coordinate with all systems as proven in the Two Generals Problem. As databases become more and more distributed this coordination will increase the difficulty of making truly atomic commits.

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