The answer is to check the ThrottledReadEvents metric to see if reads are being throttled. This is the correct first step when troubleshooting DynamoDB high read latency because throttling is the most common direct cause of latency spikes, often stemming from a hot partition where uneven partition distribution overwhelms a single node’s capacity. By examining CloudWatch metrics like ConsumedReadCapacityUnits per partition, you can pinpoint skewed access patterns that force DynamoDB to delay or reject requests, leading to increased read latency. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your ability to diagnose performance bottlenecks using CloudWatch before jumping to more complex fixes; a common trap is to immediately blame provisioned capacity limits without first verifying partition-level throttling. Remember the mnemonic “Hot Partition, High Latency” — if reads are slow, always check for a hot key first.
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.
Which THREE steps should be taken to troubleshoot an Amazon DynamoDB table that is experiencing high read latency?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Review the table's partition distribution using DynamoDB metrics.
Option A is correct because high read latency in DynamoDB can result from uneven partition distribution, where a 'hot' partition receives more read requests than others, causing throttling or increased latency. By reviewing the table's partition distribution using CloudWatch metrics like `ConsumedReadCapacityUnits` per partition, you can identify skewed access patterns and address them with strategies like partition key redesign or adaptive capacity.
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.
✓
Review the table's partition distribution using DynamoDB metrics.
Why this is correct
Uneven partition distribution can cause hot partitions and high latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the write capacity of the table.
Why it's wrong here
Write capacity does not affect read latency.
✓
Monitor the ConsumedReadCapacityUnits metric.
Why this is correct
ConsumedReadCapacityUnits shows actual read usage.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable auto scaling to prevent unexpected capacity changes.
Why it's wrong here
Disabling auto scaling may cause throttling.
✓
Check the ThrottledReadEvents metric to see if reads are being throttled.
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse write capacity adjustments with read performance fixes, or assume disabling auto scaling is a troubleshooting step, when in fact auto scaling is a best practice for maintaining consistent throughput.
Detailed technical explanation
How to think about this question
DynamoDB distributes table data across partitions based on the partition key's hash value; uneven access patterns (e.g., a single popular item) can cause a partition to exceed its read capacity units (RCUs), leading to throttling and higher latency. The `ThrottledReadEvents` metric directly indicates when reads are throttled, while `ConsumedReadCapacityUnits` helps assess whether the table is operating near its provisioned limits. In practice, using DynamoDB Accelerator (DAX) or implementing read-heavy workload patterns like cache-aside can mitigate latency, but the first troubleshooting step is to diagnose the root cause via metrics.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
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: Review the table's partition distribution using DynamoDB metrics. — Option A is correct because high read latency in DynamoDB can result from uneven partition distribution, where a 'hot' partition receives more read requests than others, causing throttling or increased latency. By reviewing the table's partition distribution using CloudWatch metrics like `ConsumedReadCapacityUnits` per partition, you can identify skewed access patterns and address them with strategies like partition key redesign or adaptive capacity.
What should I do if I get this DBS-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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Question Discussion
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