In a key-value type of non-relational database is it necessary that the key should be always unique?

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Amazon Web Services, Inc. (started in 2006) is a subsidiary of Amazon that provides on-demand cloud computing platforms and APIs to individuals, companies, and governments, on a metered, pay-as-you-go basis. Oftentimes, clients will use this in combination with autoscaling.

Basically, it is a cloud computing provider and the main profit source for Amazon.


In a key-value type of non-relational database is it necessary that the key should be always unique?