The answer is to add an RDS read replica and route reporting queries to it. This is correct because RDS read replicas are engineered specifically to offload read queries from RDS MySQL primary, allowing the primary to focus on write operations and transactional workloads while the replica handles the read-heavy reporting traffic. On the SAA-C03 exam, this scenario tests your understanding of read scaling versus write scaling—a common trap is suggesting a larger instance type or Multi-AZ, which improves availability or write performance but does not offload read queries. The key distinction is that Multi-AZ is for failover, not for read offloading, while read replicas are the direct solution for read-heavy workloads. A useful memory tip: “Read replicas read, Multi-AZ mirrors”—if the problem is too many reads, think replicas; if it’s about high availability, think Multi-AZ.
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 telemetry pipeline uses RDS MySQL and receives many read-only reporting queries that slow down the primary database. What should the architect add?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
RDS read replica and route reporting queries to it
RDS Read Replicas are designed specifically to offload read-heavy workloads from the primary database. By creating a read replica and routing the reporting queries to it, the primary database is freed from processing these read-only queries, reducing contention and improving overall performance. This is the most cost-effective and architecturally appropriate solution for read scaling in RDS MySQL.
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.
✗
Multi-AZ standby and route reads to the standby
Why it's wrong here
The Multi-AZ standby is not used for normal read scaling.
✓
RDS read replica and route reporting queries to it
Why this is correct
Read replicas offload read traffic from the primary instance.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
S3 lifecycle policy
Why it's wrong here
Lifecycle policies manage object storage cost, not RDS read load.
✗
A larger NAT gateway
Why it's wrong here
NAT throughput does not solve database read contention.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Multi-AZ standby (which is for failover, not read scaling) with a read replica, leading candidates to incorrectly choose Option A.
Detailed technical explanation
How to think about this question
RDS Read Replicas use MySQL's native asynchronous replication to maintain a near-real-time copy of the primary database. The replica can serve read traffic while the primary handles writes, and you can create up to 15 read replicas per primary instance. In a real-world scenario, if reporting queries involve complex joins or aggregations, offloading them to a read replica can reduce CPU and I/O pressure on the primary, but be aware that replica lag (typically milliseconds to seconds) may cause stale reads for time-sensitive reports.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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: RDS read replica and route reporting queries to it — RDS Read Replicas are designed specifically to offload read-heavy workloads from the primary database. By creating a read replica and routing the reporting queries to it, the primary database is freed from processing these read-only queries, reducing contention and improving overall performance. This is the most cost-effective and architecturally appropriate solution for read scaling in RDS MySQL.
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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A telemetry pipeline uses RDS MySQL and receives many read-only reporting queries that slow down the primary database. What should the architect add? The design must avoid adding custom operational scripts.
medium
A.Multi-AZ standby and route reads to the standby
✓ B.RDS read replica and route reporting queries to it
C.S3 lifecycle policy
D.A larger NAT gateway
Why B: RDS Read Replicas are designed specifically to offload read-heavy workloads from the primary database. By creating a read replica and routing reporting queries to it, the architect reduces load on the primary MySQL instance without custom scripts. This is a native, managed feature of RDS that supports asynchronous replication.
Variation 2. A telemetry pipeline uses RDS MySQL and receives many read-only reporting queries that slow down the primary database. What should the architect add? The architecture review board prefers a managed AWS-native control.
medium
A.Multi-AZ standby and route reads to the standby
✓ B.RDS read replica and route reporting queries to it
C.S3 lifecycle policy
D.A larger NAT gateway
Why B: The correct answer is B because RDS read replicas are designed specifically to offload read-heavy workloads like reporting queries from the primary database. They provide an asynchronous read-only copy of the database that can handle SELECT statements without impacting the primary's write performance. This is a fully managed AWS-native solution that aligns with the architecture review board's preference.
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This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.
Question Discussion
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