This DEA-C01 practice question tests your understanding of data store management. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data engineer needs to store transaction data that requires strong consistency, ACID transactions, and complex join queries. Which AWS service is most appropriate?
Amazon DynamoDB
Why wrong: DynamoDB is eventually consistent by default and not designed for complex joins.
Amazon RDS for PostgreSQL
RDS PostgreSQL provides ACID transactions and complex join support.
Amazon S3
Why wrong: S3 is object storage, not ACID transactional.
Amazon Redshift
Why wrong: Redshift is a data warehouse optimized for analytics, not OLTP.
Answer choices
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Related concept
Read the scenario before looking for a memorised answer.
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.
Common exam traps
The trap here is that candidates often 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.
Detailed technical explanation
PostgreSQL implements ACID compliance through its Multi-Version Concurrency Control (MVCC) mechanism, which allows concurrent transactions without locking reads, while still providing serializable isolation levels. Complex join queries benefit from PostgreSQL's query planner, which can leverage hash joins, merge joins, and nested loop joins, and supports advanced indexing like B-tree, GiST, and GIN for performance. In a real-world scenario, a financial transaction system requiring atomic debits and credits across multiple accounts with JOINs to customer and product tables would fail on DynamoDB's single-item transaction limits.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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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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