Key-value stores allow the application to store its data in a schema-less (key, value) pairs. These data can be stored in a hash table like data-types of a programming language - so that each value can be accessed by its key. Although such storage might not be very efficient - since they provide only a single way to access the values - but eliminates the need for a fixed data model.
----- : ------
Id1_Name : Niladri Biswas
Id1_Citizenship : Indian
Id2_Name : Mike Curz
Id2_Citizenship : American
Since it is guarented to always have a unique key for a particular object, we can query the database for that unique key and get the results back from whichever node has the object.
Examples involve Rika,Dynamo etc.
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