- A
Amazon Neptune
Why wrong: Neptune is a graph database, not suitable for JSON document storage.
- B
Amazon DocumentDB
Why wrong: DocumentDB is for MongoDB workloads, ACID transactions are not fully supported.
- C
Amazon DynamoDB
DynamoDB supports JSON and ACID transactions.
- D
Amazon S3
Why wrong: S3 is object storage, not a database; no ACID transactions.
Question 1,603 of 1,786
DEA-C01 Data Store Management Practice Question
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 JSON documents that are frequently updated and require ACID transactions. Which AWS database service 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
✓
Amazon DynamoDB
Amazon DynamoDB is the correct choice because it supports ACID transactions via the `TransactWriteItems` and `TransactGetItems` APIs, enabling atomic, consistent, isolated, and durable operations on JSON documents. It also provides single-digit millisecond latency for frequently updated data, making it ideal for high-throughput, transactional workloads. DynamoDB's flexible schema natively handles JSON documents, and its auto-scaling capabilities ensure performance under varying load.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 Neptune
Why it's wrong here
Neptune is a graph database, not suitable for JSON document storage.
- ✗
Amazon DocumentDB
Why it's wrong here
DocumentDB is for MongoDB workloads, ACID transactions are not fully supported.
- ✓
Amazon DynamoDB
Why this is correct
DynamoDB supports JSON and ACID transactions.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage, not a database; no ACID transactions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often assume that DocumentDB is the best choice for JSON documents requiring ACID transactions because it is a document database. However, while DocumentDB does support multi-document ACID transactions, DynamoDB is more suitable for frequently updated data due to its consistent single-digit millisecond latency, automatic scaling, and robust transaction support designed for high-throughput workloads.
Detailed technical explanation
How to think about this question
DynamoDB implements ACID transactions using a two-phase commit protocol internally, where `TransactWriteItems` ensures all specified writes (Put, Update, Delete, ConditionCheck) succeed or fail atomically, with isolation enforced via conditional writes and serializable isolation. A subtle behavior is that DynamoDB transactions have a 4 MB size limit per transaction and a 25-item limit, which can be a constraint in real-world scenarios like financial ledger updates where many items must be updated atomically. Under the hood, DynamoDB uses distributed consensus and replication across three Availability Zones to ensure durability and consistency, making it suitable for use cases like e-commerce order processing or inventory management.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Data Store Management — study guide chapter
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon DynamoDB — Amazon DynamoDB is the correct choice because it supports ACID transactions via the `TransactWriteItems` and `TransactGetItems` APIs, enabling atomic, consistent, isolated, and durable operations on JSON documents. It also provides single-digit millisecond latency for frequently updated data, making it ideal for high-throughput, transactional workloads. DynamoDB's flexible schema natively handles JSON documents, and its auto-scaling capabilities ensure performance under varying load.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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