Your company is designing a database that will contain session data for a website. The data will include notifications, personalization attributes, and products that are added to a shopping cart.
Which type of data store will provide the lowest latency to retrieve the data?
A. key/value
B. graph
C. columnar
D. document
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A is the right answer
The correct option is C
Ref: https://docs.microsoft.com/en-us/azure/architecture/guide/technology-choices/data-store-overview
According to MS document: KVP data stores are often used for:
Data caching
Session management
User preference and profile management
Product recommendation and ad serving
While a column-family db may well suite all requirements, A is likely to be the intended answer according to MS docos.
IMO, “A” is better.