The answer is to enable DynamoDB adaptive capacity, which automatically redistributes throughput to handle hot partitions and resolve write throttling without manual intervention. Adaptive capacity works by allowing a single partition to temporarily burst beyond its allocated share of read and write capacity units, using unused capacity from other partitions to absorb uneven access patterns—this directly addresses the scenario where average consumed WCU is 3500 but writes are still throttled due to a few hot user_id partitions. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding that throttling with low average consumption signals a distribution problem, not a total capacity shortage; a common trap is confusing adaptive capacity with auto scaling, which only adjusts table-level capacity and does not fix partition-level skew. Remember the key distinction: auto scaling handles overall traffic growth, while adaptive capacity handles uneven traffic distribution—think “adaptive for access patterns, auto scaling for volume.”
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. 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 media streaming company uses Amazon DynamoDB as the primary data store for user session information. The table has a partition key of 'user_id' (String) and a sort key of 'session_start_time' (Number). The table is provisioned with 5000 read capacity units (RCU) and 5000 write capacity units (WCU). Over the past week, the company noticed occasional throttling on writes during peak hours, even though the average consumed WCU is only 3500. The DynamoDB table also experiences hot partitions. The development team is considering using DynamoDB Accelerator (DAX) to cache read-heavy workloads, but the issue is with writes. The database administrator needs to resolve the write throttling and hot partitions. Which action should the administrator take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable DynamoDB adaptive capacity to automatically handle uneven access patterns.
Option A is correct because adaptive capacity automatically adjusts throughput to handle uneven access patterns, helping with hot partitions. Option B is wrong because reducing WCU would worsen throttling. Option C is wrong because enabling auto scaling adjusts capacity but doesn't address hot partitions directly. Option D is wrong because DAX caches reads, not writes.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Enable DynamoDB adaptive capacity to automatically handle uneven access patterns.
Why this is correct
Adaptive capacity helps manage hot partitions by allowing more throughput to hot keys.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Deploy DAX to cache frequent writes and reduce write load.
Why it's wrong here
DAX caches reads, not writes; it does not help with write throttling.
✗
Reduce the provisioned WCU to match the average consumption to save costs.
Why it's wrong here
Reducing WCU would increase throttling during peaks.
✗
Enable DynamoDB auto scaling for write capacity to scale based on demand.
Why it's wrong here
Auto scaling helps but does not solve hot partition issues directly.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Management and Operations — This question tests Management and Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable DynamoDB adaptive capacity to automatically handle uneven access patterns. — Option A is correct because adaptive capacity automatically adjusts throughput to handle uneven access patterns, helping with hot partitions. Option B is wrong because reducing WCU would worsen throttling. Option C is wrong because enabling auto scaling adjusts capacity but doesn't address hot partitions directly. Option D is wrong because DAX caches reads, not writes.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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