Set Key Label to a value of your choice.

将密钥标签设置为您所选的值。

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Then when a value is set, the key is removed from the database and a new record is added with the updated value.

在设置一个值后，键就从数据库中移除掉，并添加一条具有更新过的值的新记录。

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Because of their simplicity, key-value stores are useful for a smaller set of jobs but can do those jobs very quickly.

由于其简单，键值存储对于较小系列的作业非常有用，而且可以非常快速地执行那些作业。

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Any document can contain any set of keys, and any key can be associated with an arbitrarily complex value that is itself a JSON document.

FORBES: What You Need to Know About NoSQL Databases