The answer is a hot partition where a single partition key receives a disproportionate amount of write traffic, along with exceeding the maximum provisioned capacity for the table. Even with DynamoDB auto scaling enabled, throttling occurs because auto scaling adjusts total table capacity, not individual partition limits; a hot partition can saturate its 1,000 WCU or 3,000 RCU ceiling before the overall table scales up. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding that auto scaling is a table-level mechanism and does not prevent partition-level bottlenecks, a common trap where candidates assume scaling eliminates all throttling. Remember the key distinction: auto scaling manages aggregate throughput, but a single partition’s hard limit can still be hit by skewed access patterns. Memory tip: “Hot partition, cold scaling” — the partition heats up faster than the table can cool it.
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company is using Amazon DynamoDB with Auto Scaling enabled. The database specialist notices that write traffic is being throttled occasionally. Which TWO factors could cause throttling despite Auto Scaling?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The write traffic exceeds the maximum provisioned capacity that was set for Auto Scaling.
Options A and D are correct. Hot partitions (A) can cause throttling even with Auto Scaling because a single partition can exceed its limit. Throttling due to exceeding the maximum provisioned capacity (D) can also occur. Option B is wrong because Global Tables replicate writes but do not cause throttling. Option C is wrong because Auto Scaling is disabled? (the question says enabled, so C is irrelevant). Option E is wrong because DAX is for reads.
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.
✗
The table has Global Tables enabled, causing cross-region replication overhead.
Why it's wrong here
Global Tables do not cause throttling; they replicate writes.
✗
Auto Scaling is not configured to scale up quickly enough for sudden traffic spikes.
Why it's wrong here
Auto Scaling can handle spikes, but it may not react instantly.
✗
DynamoDB Accelerator (DAX) is not caching write operations.
Why it's wrong here
DAX is a read cache and does not affect writes.
✓
The write traffic exceeds the maximum provisioned capacity that was set for Auto Scaling.
Why this is correct
Auto Scaling cannot scale beyond the configured maximum.
Related concept
Static NAT maps one inside address to one outside address.
✓
A hot partition where a single partition key receives a disproportionate amount of write traffic.
Why this is correct
Hot partitions can exceed the per-partition throughput limit.
Related concept
Static NAT maps one inside address to one outside address.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: The write traffic exceeds the maximum provisioned capacity that was set for Auto Scaling. — Options A and D are correct. Hot partitions (A) can cause throttling even with Auto Scaling because a single partition can exceed its limit. Throttling due to exceeding the maximum provisioned capacity (D) can also occur. Option B is wrong because Global Tables replicate writes but do not cause throttling. Option C is wrong because Auto Scaling is disabled? (the question says enabled, so C is irrelevant). Option E is wrong because DAX is for reads.
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.
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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