SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. 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 DynamoDB table for a travel booking site has a partition key based only on the current date. Write throttling occurs during business hours. What is the best design change? The architecture review board prefers a managed AWS-native control.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a higher-cardinality partition key that distributes writes across partitions
Option D is correct because using a low-cardinality partition key like the current date causes all writes to land on a single partition, leading to throttling. By choosing a higher-cardinality partition key (e.g., combining date with a user ID or booking ID), writes are distributed evenly across multiple partitions, leveraging DynamoDB's internal partitioning to handle the throughput. This is a managed, AWS-native design change that resolves hot partition issues without additional services.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Create a global secondary index with the same date key
Why it's wrong here
A GSI with the same hot key can suffer the same partition problem.
✗
Move the table to S3 Glacier Instant Retrieval
Why it's wrong here
S3 Glacier is object storage and not a DynamoDB write scaling solution.
✗
Reduce the table's write capacity
Why it's wrong here
Reducing capacity worsens throttling.
✓
Use a higher-cardinality partition key that distributes writes across partitions
Why this is correct
A low-cardinality hot partition causes throttling; a better key spreads writes more evenly.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a GSI as a solution for write performance, when in fact GSIs only help with read query patterns and do not alleviate write hot spots on the base table.
Detailed technical explanation
How to think about this question
DynamoDB partitions data based on the partition key's hash value; a low-cardinality key like a date results in all writes hashing to the same partition, exceeding its 1,000 WCU limit. Using a composite key (e.g., date#user_id) increases cardinality, allowing DynamoDB to distribute writes across multiple partitions, each with its own throughput capacity. In practice, this design also improves read performance by avoiding skewed access patterns, a common issue in time-series workloads.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Design High-Performing Architectures — This question tests Design High-Performing Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a higher-cardinality partition key that distributes writes across partitions — Option D is correct because using a low-cardinality partition key like the current date causes all writes to land on a single partition, leading to throttling. By choosing a higher-cardinality partition key (e.g., combining date with a user ID or booking ID), writes are distributed evenly across multiple partitions, leveraging DynamoDB's internal partitioning to handle the throughput. This is a managed, AWS-native design change that resolves hot partition issues without additional services.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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