The answer is to create a global secondary index (GSI) on the guild table with partition key guild_id and sort key member_id. This is correct because the existing table lacks a sort key, so querying all members of a guild requires a full scan or inefficient filtering; a GSI with guild_id as the partition key and member_id as the sort key allows a single, efficient Query operation to retrieve all members in order, drastically reducing latency. On the AWS Certified Data Engineer Associate DEA-C01 exam, this tests your understanding of access pattern design and GSI optimization—a common trap is assuming more RCUs or DAX will fix a poorly modeled query, but they only mask the underlying inefficiency. Remember: when you need to query all items sharing a partition key, you must have a sort key on that attribute; a GSI is the tool to add it without changing the base table. Memory tip: “GSI gives you a sort key where there was none—query the guild, not the grid.”
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 gaming company uses Amazon DynamoDB to store player profiles and game state. The table has a partition key of 'player_id' and no sort key. The table is provisioned with 5,000 RCUs and 5,000 WCUs. The application performs frequent reads and writes to update player scores. Recently, the company introduced a new feature that allows players to form guilds. The guild data is stored in a separate DynamoDB table with a partition key of 'guild_id'. The application often needs to retrieve all members of a guild. The data engineer is encountering high latency when querying the guild table because the guilds can have up to 100 members. The engineer wants to reduce latency without changing the application architecture. What should the data engineer do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a global secondary index (GSI) on the guild table with partition key guild_id and sort key member_id.
Option B is correct because adding a global secondary index (GSI) on the guild table with guild_id as the partition key and member_id as the sort key allows efficient queries for all members of a guild. Option A is wrong because increasing capacity may not solve the access pattern issue. Option C is wrong because DynamoDB Streams are for change data capture, not for query optimization. Option D is wrong because DAX caches read results; if the query pattern is inefficient, DAX won't help much.
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.
✗
Increase the provisioned read and write capacity for the guild table to 10,000 RCUs and 10,000 WCUs.
Why it's wrong here
Higher capacity may reduce throttling but does not address the inefficient query pattern.
✓
Create a global secondary index (GSI) on the guild table with partition key guild_id and sort key member_id.
Why this is correct
The GSI allows efficient retrieval of all members of a guild by querying on guild_id.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable DynamoDB Streams on the guild table and process the stream to populate a separate read table.
Why it's wrong here
This adds complexity and latency; the GSI is a simpler solution.
✗
Use DynamoDB Accelerator (DAX) to cache the results of the guild queries.
Why it's wrong here
DAX caches responses but does not change the query pattern; the query will still be inefficient.
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: Create a global secondary index (GSI) on the guild table with partition key guild_id and sort key member_id. — Option B is correct because adding a global secondary index (GSI) on the guild table with guild_id as the partition key and member_id as the sort key allows efficient queries for all members of a guild. Option A is wrong because increasing capacity may not solve the access pattern issue. Option C is wrong because DynamoDB Streams are for change data capture, not for query optimization. Option D is wrong because DAX caches read results; if the query pattern is inefficient, DAX won't help much.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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