!!! Overview
[{$pagename}] is one of the [ACID] transaction properties. 

An [atomic] transaction is an indivisible and irreducible series of database operations such that either all occur, or nothing occurs.

[{$pagename}] implies a guarantee that an [update] to the [database] occurring only partially, which can cause greater problems than rejecting the whole series outright. As a consequence, the transaction cannot be observed to be in progress by another client. At one moment in time, it has not yet happened, and at the next it has already occurred in whole (or nothing happened if the transaction was cancelled in progress).

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Atomicity_(database_systems)|Wikipedia:Atomicity_(database_systems)|target='_blank'] - based on information obtained 2016-07-24-