DEA-C01 Data Store Management Practice Question
A data engineer needs to store transaction data that requires strong consistency, ACID transactions, and complex join queries. Which AWS service is most appropriate?
⚠ Common exam trap
Test-takers frequently confuse DynamoDB's 'eventually consistent reads' with strong consistency, or assume its limited transaction API can replace full ACID relational databases, but the question explicitly requires complex joins and ACID transactions, which only a relational database like PostgreSQL can provide.
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
✓
Amazon RDS for PostgreSQL
Amazon RDS for PostgreSQL is the most appropriate choice because it provides full ACID transaction support, strong consistency, and the ability to perform complex join queries using standard SQL. Unlike NoSQL or data warehouse solutions, PostgreSQL is a relational database that excels at enforcing referential integrity and supporting multi-table joins with advanced indexing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon DynamoDB
Why it's wrong here
DynamoDB is a key-value and document store offering single-item ACID transactions, not complex multi-table joins; its query model relies on partition and sort keys with secondary indexes. It suits high-throughput, low-latency access at scale. A relational service such as Amazon RDS or Aurora would satisfy the join and transactional requirements.
- ✓
Amazon RDS for PostgreSQL
Why this is correct
Amazon RDS for PostgreSQL provides ACID transactions, strong consistency and full SQL joins, matching all three stated requirements. Its relational engine supports complex multi-table joins natively, unlike purpose-built NoSQL stores that trade joins and cross-item transactions for scale.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage accessed via HTTP APIs, offering eventual or strong read-after-write consistency per object but no multi-row ACID transactions or SQL joins. It suits data lakes, backups and static content. A relational database such as Amazon RDS or Aurora is required for transactional joins.
- ✗
Amazon Redshift
Why it's wrong here
Redshift is a columnar analytics warehouse tuned for large-scale aggregation and parallel scans, not the low-latency transactional ACID workload described. It is tempting because it does support SQL joins and ACID semantics for reporting; it would be the right choice for complex analytical queries over consolidated historical data rather than live transaction processing.
Go deeper
Related to this question
About these practice questions
This DEA-C01 question is part of Courseiva's 1,321-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services 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 DEA-C01 exam.