ITPEC FE Morning April 2021 Question 29
Which of the following is the appropriate explanation of the key value store that is used in the processing of big data?
Explanation
Data stored as a pair with a unique identifying value — a key-value store keeps each item under its own key and nothing else.
A key-value store, one of the NoSQL models used for big data, saves every item as a pair: a key that identifies it uniquely and the value itself, whose content the store does not interpret. Access is by key only, which makes reads and writes fast and lets the data be split across many servers by key.
Answer (c)
Why not others:
- •(a) — two-dimensional tables of rows and columns based on set theory describe a relational database
- •(b) — nodes, relationships and properties describe a graph database
- •(d) — self-describing documents whose structure can change with each record describe a document database
Key rule: Match the NoSQL type to its unit of data: a pair for key-value, a document for document stores, nodes and edges for graph databases, and fixed tables for the relational model.
Databases · AI-written, may contain errors
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