The correct answer is to modify the Lambda function to check the 'awsRegion' attribute in the stream record and ignore records from other regions. This works because DynamoDB global tables replicate every write across all configured regions, and each regional replica independently generates its own stream record for the same update. Without filtering, the Lambda function in us-east-1 processes both the local write and the replicated write from eu-west-1, causing duplicate processing and increased write latency due to cross-region stream propagation. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of how global tables and DynamoDB Streams interact, with a common trap being to disable streams in other regions—which would break replication—or to increase concurrency, which does not address the root cause. Remember the key insight: each region’s stream is independent, so you must filter by the awsRegion attribute to avoid duplicates. A helpful memory tip is “Filter the region, not the stream.”
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 social media company runs a multi-region application on Amazon DynamoDB with global tables. The application is deployed in us-east-1 and eu-west-1. Recently, they enabled DynamoDB Streams on the table to trigger an AWS Lambda function for real-time analytics. The Lambda function runs in us-east-1. After enabling streams, they notice that the Lambda function is triggered multiple times for the same update, and the application's write latency in eu-west-1 has increased. The company has strict latency requirements. A database specialist is asked to resolve the issue. What should the database specialist recommend?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the Lambda function to check the 'awsRegion' attribute in the stream record and ignore records from other regions.
Option C is correct because global tables replicate writes across regions, and each write generates a stream record. The Lambda function should filter on the 'awsRegion' attribute in the stream record to avoid processing the same update from different regions. Option A is wrong because disabling streams in eu-west-1 would break the replication. Option B is wrong because using a dedicated stream for each region is not supported. Option D is wrong because increasing Lambda concurrency doesn't prevent duplicate processing.
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.
✗
Increase the Lambda function's reserved concurrency to handle duplicate events faster.
Why it's wrong here
This does not address the root cause of duplicates.
✗
Create a separate Lambda function in eu-west-1 and use a local stream.
Why it's wrong here
Global tables replicate writes; each region's stream captures local writes only, but the same write appears in each region's stream.
✓
Modify the Lambda function to check the 'awsRegion' attribute in the stream record and ignore records from other regions.
Why this is correct
This prevents duplicate processing of the same write event.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable DynamoDB Streams on the eu-west-1 replica table.
Why it's wrong here
Disabling streams on the replica would stop replication from that region.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the Lambda function to check the 'awsRegion' attribute in the stream record and ignore records from other regions. — Option C is correct because global tables replicate writes across regions, and each write generates a stream record. The Lambda function should filter on the 'awsRegion' attribute in the stream record to avoid processing the same update from different regions. Option A is wrong because disabling streams in eu-west-1 would break the replication. Option B is wrong because using a dedicated stream for each region is not supported. Option D is wrong because increasing Lambda concurrency doesn't prevent duplicate processing.
What should I do if I get this DBS-C01 question wrong?
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is using Amazon DynamoDB and has enabled DynamoDB Streams. The application needs to process stream records in real-time. Which AWS service can be used to invoke a Lambda function automatically for each stream record?
easy
A.Amazon Kinesis Data Firehose
B.Amazon Simple Queue Service (SQS)
C.AWS Step Functions
✓ D.AWS Lambda
Why D: Option B is correct because Lambda can be triggered directly from DynamoDB Streams. Option A is wrong because Kinesis Data Firehose is for loading streaming data into destinations, not for triggering Lambda. Option C is wrong because SQS is for message queuing, not directly from DynamoDB Streams. Option D is wrong because Step Functions coordinates workflows, but does not directly trigger from DynamoDB Streams without Lambda.
Last reviewed: Jun 20, 2026
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This DBS-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 DBS-C01 exam.
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