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.
Exhibit
Amazon RDS for PostgreSQL metrics during the end-of-day report window:
- CPUUtilization: 24%
- ReadLatency: 118 ms
- WriteLatency: 7 ms
- DiskQueueDepth: 0.4
- FreeStorageSpace: stable
Application notes:
- Report queries are read-only and run for 20 to 30 minutes
- The operational API continues to perform writes during the report window
- Business accepts slightly stale report data if write performance stays unchanged
Based on the exhibit, what is the best change to improve read performance without increasing write latency on the primary database?
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.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Amazon RDS for PostgreSQL metrics during the end-of-day report window:
- CPUUtilization: 24%
- ReadLatency: 118 ms
- WriteLatency: 7 ms
- DiskQueueDepth: 0.4
- FreeStorageSpace: stable
Application notes:
- Report queries are read-only and run for 20 to 30 minutes
- The operational API continues to perform writes during the report window
- Business accepts slightly stale report data if write performance stays unchanged
A
Create an RDS read replica and direct the reporting queries to the replica endpoint.
A read replica offloads the long-running read-only reports from the primary database, which preserves write performance and reduces read latency for the reporting workload. Because the business accepts slightly stale report data, the asynchronous replication delay is acceptable. This is the most direct and AWS-native way to separate read pressure from writes.
B
Convert the DB instance to Multi-AZ so the primary can serve more reads.
Why wrong: Multi-AZ improves availability and failover behavior, but it does not add read scaling capacity for reporting traffic.
C
Increase the primary instance class to a larger size and keep all traffic on one writer.
Why wrong: A larger instance might help temporarily, but it keeps read and write workloads competing on the same primary database.
D
Migrate the reporting workload to DynamoDB to gain faster reads.
Why wrong: That would require a data model redesign and service migration, which is unnecessary for the stated problem and not the simplest performance fix.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an RDS read replica and direct the reporting queries to the replica endpoint.
Creating an RDS read replica offloads read-heavy reporting queries from the primary database instance, improving read performance without increasing write latency on the primary. The replica operates asynchronously, so writes on the primary are not blocked or delayed by the reporting workload.
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 an RDS read replica and direct the reporting queries to the replica endpoint.
Why this is correct
A read replica offloads the long-running read-only reports from the primary database, which preserves write performance and reduces read latency for the reporting workload. Because the business accepts slightly stale report data, the asynchronous replication delay is acceptable. This is the most direct and AWS-native way to separate read pressure from writes.
Clue confirmation
The clue words "best", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Convert the DB instance to Multi-AZ so the primary can serve more reads.
Why it's wrong here
Multi-AZ improves availability and failover behavior, but it does not add read scaling capacity for reporting traffic.
✗
Increase the primary instance class to a larger size and keep all traffic on one writer.
Why it's wrong here
A larger instance might help temporarily, but it keeps read and write workloads competing on the same primary database.
✗
Migrate the reporting workload to DynamoDB to gain faster reads.
Why it's wrong here
That would require a data model redesign and service migration, which is unnecessary for the stated problem and not the simplest performance fix.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Multi-AZ (which only provides failover redundancy) with read replicas (which provide read scaling), leading candidates to incorrectly select Multi-AZ as a performance solution.
Detailed technical explanation
How to think about this question
RDS read replicas use MySQL, MariaDB, PostgreSQL, or Oracle's native asynchronous replication engine to maintain a near-real-time copy of the primary database. The replica can be promoted to a standalone instance if needed, and you can create up to 15 replicas for MySQL, MariaDB, and PostgreSQL to distribute read traffic further. In a real-world scenario, a reporting dashboard running complex aggregation queries can be pointed to a read replica, keeping the primary free for transactional writes.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: Create an RDS read replica and direct the reporting queries to the replica endpoint. — Creating an RDS read replica offloads read-heavy reporting queries from the primary database instance, improving read performance without increasing write latency on the primary. The replica operates asynchronously, so writes on the primary are not blocked or delayed by the reporting workload.
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", "primary". 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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