Question 764 of 1,711
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 eventually consistent by default and not designed for complex joins.
- ✓
Amazon RDS for PostgreSQL
Why this is correct
RDS PostgreSQL provides ACID transactions and complex join support.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage, not ACID transactional.
- ✗
Amazon Redshift
Why it's wrong here
Redshift is a data warehouse optimized for analytics, not OLTP.
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Last reviewed: Jun 24, 2026
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.
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