- A
Consistent reads require S3 Object Lock.
Why wrong: Object Lock is for retention, not consistency.
- B
Strong consistency for all operations.
Why wrong: While S3 now has strong consistency, the question asks about new files specifically.
- C
Eventual consistency for all operations.
Why wrong: S3 now provides strong consistency for all operations.
- D
Read-after-write consistency for new object PUTS.
S3 provides read-after-write consistency for new objects, so they are immediately visible.
Question 176 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 is designing a data lake on AWS using Amazon S3. The data consists of CSV files generated by IoT devices. The data is accessed by multiple analytics jobs, and the engineer needs to ensure that new files are immediately visible to all consumers after writing. What S3 consistency model applies?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
✓
Read-after-write consistency for new object PUTS.
Option D is correct because Amazon S3 provides strong read-after-write consistency for PUTS of new objects. This means that as soon as a new CSV file is written to an S3 bucket, it is immediately visible to all subsequent read requests across all analytics jobs, without any window of inconsistency.
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.
- ✗
Consistent reads require S3 Object Lock.
Why it's wrong here
Object Lock is for retention, not consistency.
- ✗
Strong consistency for all operations.
Why it's wrong here
While S3 now has strong consistency, the question asks about new files specifically.
- ✗
Eventual consistency for all operations.
Why it's wrong here
S3 now provides strong consistency for all operations.
- ✓
Read-after-write consistency for new object PUTS.
Why this is correct
S3 provides read-after-write consistency for new objects, so they are immediately visible.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may incorrectly choose 'Strong consistency for all operations' (option B) because S3 now provides strong consistency since December 2020. However, the question specifically asks about 'new files' after write, which is precisely read-after-write consistency for new object PUTS. The pitfall is confusing the general strong consistency model with the specific behavior for new objects, or mistakenly thinking read-after-write differs from strong consistency.
Detailed technical explanation
How to think about this question
Under the hood, S3 achieves strong consistency by using a quorum-based replication system across multiple Availability Zones. When a new object is PUT, the write is committed to all replicas before returning a success response, ensuring that any subsequent GET or LIST request sees the latest data. In real-world scenarios, this eliminates the need for workarounds like using S3 Event Notifications or introducing artificial delays to avoid stale reads in data pipelines.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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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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: Read-after-write consistency for new object PUTS. — Option D is correct because Amazon S3 provides strong read-after-write consistency for PUTS of new objects. This means that as soon as a new CSV file is written to an S3 bucket, it is immediately visible to all subsequent read requests across all analytics jobs, without any window of inconsistency.
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.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
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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