The correct answer is to add a Global Secondary Index (GSI) with a different partition key, such as game_id, to distribute the write traffic. This resolves the hot partition caused by using user_id as the sole partition key, where a single user’s high-volume writes during a game launch overwhelm one partition. By introducing a GSI with a high-cardinality attribute like game_id, you spread the write load across multiple partitions, directly addressing the throttling and latency. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of DynamoDB hot partition optimization and the strategic use of composite keys and GSIs to rebalance access patterns. A common trap is assuming that increasing read capacity or adding DAX will fix write-heavy hot spots—DAX only caches reads, not writes. Remember the memory tip: “Hot partition? Change the partition—GSI with high cardinality spreads the load.”
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 uses Amazon DynamoDB for a gaming application. During a new game launch, the application experiences high latency and throttling on a table with a partition key of 'user_id' and a sort key of 'timestamp'. The access pattern is to query recent items for a given user. Which TWO design changes can improve performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a composite key with 'game_id' as partition key and 'timestamp' as sort key.
Option A is correct because using a Global Secondary Index (GSI) with a different key can distribute traffic. Option D is correct because adding a GSI with 'game_id' as partition key can distribute writes if 'game_id' has high cardinality. Option B is wrong because increasing read capacity doesn't solve hot partition issues. Option C is wrong because simple queries are fine. Option E 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.
✗
Use strongly consistent reads for all queries.
Why it's wrong here
Strongly consistent reads consume more capacity and don't fix partitioning.
✓
Use a composite key with 'game_id' as partition key and 'timestamp' as sort key.
Why this is correct
A better partition key (game_id) can distribute writes evenly.
Related concept
Static NAT maps one inside address to one outside address.
✓
Add a Global Secondary Index (GSI) with a different partition key.
Why this is correct
A GSI can distribute read/write load across partitions.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the provisioned read capacity for the table.
Why it's wrong here
Increasing RCU doesn't address hot partition issues.
✗
Enable DynamoDB Accelerator (DAX) to cache write operations.
Why it's wrong here
DAX does not cache writes.
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 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.
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: Use a composite key with 'game_id' as partition key and 'timestamp' as sort key. — Option A is correct because using a Global Secondary Index (GSI) with a different key can distribute traffic. Option D is correct because adding a GSI with 'game_id' as partition key can distribute writes if 'game_id' has high cardinality. Option B is wrong because increasing read capacity doesn't solve hot partition issues. Option C is wrong because simple queries are fine. Option E 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.
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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