This DEA-C01 practice question tests your understanding of data store management. 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. The table has a partition key of 'user_id' and a sort key of 'game_timestamp'. The application frequently queries by 'user_id' and filters by 'game_timestamp' within a specific date range. The queries are slow. The table has a global secondary index (GSI) on 'game_timestamp'. What is the most likely cause of the slow queries?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A hot partition exists due to uneven access pattern on 'user_id'.
Option B is correct because querying by 'user_id' using the base table is efficient, but if the GSI is being used for queries that filter by 'game_timestamp' without the partition key, the GSI may not be designed optimally. However, the stem says queries are by 'user_id' and filter by 'game_timestamp' – that should use the base table. Option A is not likely because sort key filtering is efficient. Option C (hot partition) is possible if 'user_id' distribution is skewed. Option D (GSI write capacity) doesn't affect reads. The most likely cause is a hot partition due to uneven 'user_id' distribution.
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 GSI has insufficient read capacity.
Why it's wrong here
Queries are on the base table, not the GSI.
✗
The GSI is used instead of the base table for queries on 'user_id'.
Why it's wrong here
Queries on 'user_id' should use the base table, not the GSI.
✓
A hot partition exists due to uneven access pattern on 'user_id'.
Why this is correct
If a few 'user_id' values are accessed frequently, they create hot partitions, slowing queries.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The sort key is not used in the query.
Why it's wrong here
The query uses the sort key filter, but that should work fine.
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 DEA-C01 NAT questions on configuration and troubleshooting.
Data Store Management — This question tests Data Store Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: A hot partition exists due to uneven access pattern on 'user_id'. — Option B is correct because querying by 'user_id' using the base table is efficient, but if the GSI is being used for queries that filter by 'game_timestamp' without the partition key, the GSI may not be designed optimally. However, the stem says queries are by 'user_id' and filter by 'game_timestamp' – that should use the base table. Option A is not likely because sort key filtering is efficient. Option C (hot partition) is possible if 'user_id' distribution is skewed. Option D (GSI write capacity) doesn't affect reads. The most likely cause is a hot partition due to uneven 'user_id' distribution.
What should I do if I get this DEA-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 DEA-C01 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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