DP-900 Describe core data concepts Practice Question
Which TWO of the following are common characteristics of a NoSQL database?
⚠ Common exam trap
Test-takers frequently confuse 'flexible schema' with 'no schema at all' or mistakenly think NoSQL always supports strong ACID transactions, when in reality most NoSQL systems trade ACID for scalability and performance.
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
✓
Flexible schema
NoSQL databases, such as MongoDB or Cassandra, use a flexible schema that allows documents or records to have varying fields without requiring predefined table structures. This enables developers to iterate quickly and store semi-structured or unstructured data, such as JSON documents, without costly schema migrations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Flexible schema
Why this is correct
NoSQL databases allow schema flexibility, making them suitable for semi-structured or unstructured data.
- ✗
Normalized data storage
Why it's wrong here
Normalization is a relational database practice, not typical for NoSQL.
- ✗
Strong ACID transaction support
Why it's wrong here
Many NoSQL databases sacrifice ACID for performance and scalability.
- ✗
Relational data model
Why it's wrong here
NoSQL databases use non-relational models.
- ✓
Horizontal scaling
Why this is correct
NoSQL databases are designed to scale out across many nodes.
Go deeper
Related to this question
Learn chapter
Data Roles and Core Concepts
Key term
Table
A table is a structured collection of data organized into rows and columns, used in databases and spreadsheets to store and manage information efficiently.
Key term
Data
Data is raw, unprocessed information, like numbers, words, or measurements, that can be stored, processed, and analyzed by computers.
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