A database's consistency refers to the reliability of its functions' performance. A consistent system is one in which reads return the value of the last write, and reads at a given time epoch return the same value regardless of where they were initiated.
NoSQL databases support a range of consistency models, such as the following:
- Strong consistency: A system that is strongly consistent ensures that updates to a given key are ordered and reads reflect the latest update that has been accepted by the system
- Timeline consistency: A system that is timeline consistent ensures that updates to a given key are ordered in all the replicants, but reads at a given replicant might be stale and may not reflect the latest ...
