DBS-C01 Management and Operations Practice Question
A company is running an Amazon RDS for MySQL Multi-AZ DB instance. They notice increased latency during peak hours. The DB instance type is db.r5.large, and the storage is General Purpose SSD (gp2) with 500 GB. The application is read-heavy with frequent SELECT queries. Which action would most likely resolve the latency issue without changing the DB instance class?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an Amazon RDS read replica in the same region.
Adding a read replica offloads read traffic from the primary instance, reducing latency. Option A is wrong because enabling Performance Insights is for monitoring and analysis, not directly improving performance. Option C is wrong because Multi-AZ is for high availability, not read scaling. Option D is wrong because increasing storage size may improve IOPS but does not directly address the read load.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable Performance Insights and analyze queries.
Why it's wrong here
Enabling Performance Insights is for monitoring and analysis, not directly improving performance.
- ✓
Create an Amazon RDS read replica in the same region.
Why this is correct
Adding a read replica offloads read traffic from the primary instance, reducing latency.
- ✗
Enable Multi-AZ on the existing DB instance.
Why it's wrong here
Enabling Multi-AZ is redundant here as the question explicitly states the company is already running a Multi-AZ DB instance. Multi-AZ provides high availability and automatic failover to a synchronous standby replica in a different Availability Zone, rather than distributing read workloads or improving read latency for a read-heavy application. This option is tempting because Multi-AZ is a fundamental best practise for production resilience. It would be the correct choice if the objective was to improve database availability and fault tolerance against instance failure, and it wasn't already configured.
- ✗
Increase the allocated storage to 1,000 GB.
Why it's wrong here
Increasing storage size may improve IOPS but does not directly address the read load.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 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 DBS-C01 exam.