DEA-C01 Data Operations and Support Practice Question
A company runs a critical PostgreSQL database on Amazon RDS. The database experiences high read latency during peak hours. The data engineer needs to reduce read latency with minimal changes to the application. Which solution is MOST effective?
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 a read replica of the RDS instance and redirect read queries to it.
Creating a read replica offloads read queries from the primary instance, reducing read latency with minimal application changes. The application simply needs to direct read-only queries to the replica endpoint. Option A is incorrect because deleting unused indexes may help write performance but does not directly address high read latency during peak hours. Option B is incorrect because enabling Multi-AZ is for high availability and failover, not for improving read performance. Option C is incorrect because increasing the DB instance class can improve performance but is more disruptive and costly compared to adding a read replica, and may require downtime for resizing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Delete unused indexes to improve query performance.
Why it's wrong here
Index maintenance may help but is not the most effective for read latency reduction during peak.
- ✗
Enable Multi-AZ deployment for automatic failover.
Why it's wrong here
Multi-AZ does not improve read performance.
- ✗
Increase the DB instance class to a larger size with more memory.
Why it's wrong here
Scaling up helps but is not minimal; application may need connection changes.
- ✓
Create a read replica of the RDS instance and redirect read queries to it.
Why this is correct
Read replicas distribute read load, reducing latency.
Go deeper
Related to this question
About these practice questions
Courseiva writes every DEA-C01 question from scratch — 1,711 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-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 DEA-C01 exam.