Question 238 of 1,660
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company is using an AWS Lambda function to process files uploaded to an S3 bucket. The function is written in Python and uses the boto3 library to read the files. Recently, some files have been processed multiple times. Which TWO measures should a solutions architect implement to ensure idempotent processing?
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
✓
Use a DynamoDB table to store processed file IDs and check for duplicates before processing.
Options A and D are correct. Using a DynamoDB table to store processed file IDs (A) ensures idempotency by checking for duplicates before processing. Configuring S3 event notifications with prefix and suffix filters (D) reduces the chance of triggering multiple invocations for the same file. Option B is incorrect because simply using an SQS queue does not guarantee idempotent processing; additional deduplication logic is needed. Option C is incorrect because increasing the Lambda timeout does not prevent multiple invocations. Option E is incorrect because S3 Transfer Acceleration improves upload speed, not idempotency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use a DynamoDB table to store processed file IDs and check for duplicates before processing.
Why this is correct
Idempotency key store prevents duplicate processing.
- ✗
Configure the S3 bucket to send events to an SQS queue and use the Lambda function to poll the queue.
Why it's wrong here
SQS helps with scaling but still needs deduplication logic.
- ✗
Increase the Lambda function timeout to 15 minutes.
Why it's wrong here
Timeout does not prevent duplicate processing.
- ✓
Configure S3 event notifications to filter by prefix and suffix to avoid triggering multiple times.
Why this is correct
Filtering reduces unnecessary invocations.
- ✗
Enable S3 Transfer Acceleration on the bucket.
Why it's wrong here
Transfer Acceleration improves upload speed, not idempotency.
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 |
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Last reviewed: Jun 20, 2026
This SAP-C02 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 SAP-C02 exam.
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