This theorem, also mentioned Brewers theorem, states the impossibility of a data store to provide more than two of the following three guarantees.

  1. Consistency
  2. Availability
  3. Partition tolerance

Sometimes one mistakenly uses this theorem to say that a third has to be offered for the other two. That is not what the theorem says. The key is that the theorem applies when there is a failure on the storage partition.

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