techdict talk:Atomicity

اقتراحات

• آلية الرجوع

--محمد سعد 07:47, 26 مارس 2007

• ذريًة

--محمد سعد 07:45, 26 مارس 2007

تعليقات

Oooooopssss

1. the number of atoms in a molecule of a gas. 2. valence. [Origin: 1860–65; atomic + -ity] Dictionary.com Unabridged (v 1.1) Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006. American Heritage Dictionary - Cite This Source at·o·mic·i·ty (āt'ə-mĭs'ĭ-tē) Pronunciation Key n.

  1. The state of being composed of atoms.
  2. Chemistry
        1. The number of atoms in a molecule.
        2. Valence.

See also Atomicity (disambiguation).

In database systems, atomicity is one of the ACID transaction properties. An atomic transaction is a series of database operations which either all occur, or all do not occur ("fail", although failure is not considered catastrophic). A guarantee of atomicity prevents updates to the database occurring only partially, which can cause greater problems than rejecting the whole series outright.

One example of atomicity is in ordering airline tickets. Tickets must either be paid for and reserved on a flight, or neither paid for nor reserved. It is not acceptable for customers to pay for tickets without securing their requested flight or to reserve tickets without payment succeeding. One atomic transaction might include the booking not only of flights, but of hotels and transport, in exchange for the right money at the exact current exchange rate.

--محمد سعد 07:43, 26 مارس 2007

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