DA0-002 Data Concepts and Environments Practice Question
Which THREE of the following are NoSQL database types?
⚠ Common exam trap
CompTIA often tests the distinction between legacy database models (hierarchical) and modern NoSQL categories, leading candidates to mistakenly include hierarchical as a NoSQL type due to its non-relational nature.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Document
Document databases, such as MongoDB, store data in flexible, JSON-like documents (BSON in MongoDB's case). This allows for nested structures and schema-less designs, making them a core NoSQL category distinct from relational models.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Document
Why this is correct
Document stores (e.g., MongoDB) are NoSQL.
- ✗
Hierarchical
Why it's wrong here
Hierarchical databases are an older model, not typically considered NoSQL.
- ✗
Relational
Why it's wrong here
Relational databases (SQL) are not NoSQL.
- ✓
Key-Value
Why this is correct
Key-value stores (e.g., Redis) are NoSQL.
- ✓
Graph
Why this is correct
Graph databases are a NoSQL category.
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