DA0-002 Data Concepts and Environments Practice Question
A company needs to store raw data from IoT sensors for future machine learning projects. The data is expected to be massive and in various formats. Which storage solution is most appropriate?
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
✓
Data lake
A data lake stores raw data in its native format without predefined schema, ideal for large volumes of varied data for future use.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Data mart
Why it's wrong here
A data mart holds a focused subset of structured data serving one department's reporting needs, so it cannot absorb massive, multi-format raw IoT feeds. It would be correct where a business unit needs a curated slice of warehouse data for its own analytics.
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Data warehouse
Why it's wrong here
A data warehouse stores structured, modelled data loaded through schema-on-write transformations, so varied raw IoT formats would need cleansing and conversion before landing. It suits curated analytical reporting, not landing massive volumes of unprocessed source data for later machine learning.
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Data lake
Why this is correct
A data lake stores raw data in its native format, schema-on-read, so massive volumes of varied IoT sensor output can land without upfront transformation. This satisfies the stem's requirement for diverse formats retained for future machine learning, where structure is imposed only at analysis time.
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Relational database
Why it's wrong here
Relational databases enforce fixed schemas and typed columns, so varied IoT formats would need costly transformation before ingestion and cannot scale to massive raw volumes. They suit structured transactional workloads with defined relationships, such as order processing, where ACID guarantees matter.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DA0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-002 exam.