DS0-001 · Question #72
DS0-001 Question #72: Real Exam Question with Answer & Explanation
The correct answer is B: Key-value stores. Key-value stores (B) are a foundational NoSQL database type that store data as simple pairs of unique keys mapped to values - examples include Redis and DynamoDB - making them ideal for caching, sessions, and fast lookups without a fixed schema. Why the distractors are wrong: A (
Question
Which of the following database structures is a type of NoSQL database?
Options
- AHierarchical
- BKey-value stores
- CCloud
- DObject-oriented
Explanation
Key-value stores (B) are a foundational NoSQL database type that store data as simple pairs of unique keys mapped to values - examples include Redis and DynamoDB - making them ideal for caching, sessions, and fast lookups without a fixed schema.
Why the distractors are wrong:
- A (Hierarchical) is a pre-relational database model from the 1960s–70s (like IBM's IMS), predating the NoSQL movement entirely - it's its own separate category.
- C (Cloud) is a deployment environment, not a database structure; NoSQL databases can run in the cloud, but "cloud" itself describes where data lives, not how it's organized.
- D (Object-oriented) databases store data as objects matching OOP models, but they are their own distinct database paradigm - not typically classified under the NoSQL umbrella.
Memory tip: NoSQL = "Not Only SQL," and it groups four main structures - Key-value, Document, Column-family, and Graph - use the mnemonic "Kids Don't Cry" to recall them on exam day.
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