DBS-C01 Monitoring and Troubleshooting Practice Question
A company uses Amazon Aurora MySQL. They notice that the DB cluster's failover took longer than expected during a recent primary instance failure. CloudWatch shows Failover latency of 120 seconds. Which configuration change would most likely reduce the failover time?
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
✓
Configure the application to use the cluster endpoint with Aurora JDBC driver's fast failover feature.
Configuring the application to use the cluster endpoint with the Aurora JDBC driver's fast failover feature allows the driver to quickly detect the new writer after a failover and reconnect, significantly reducing the perceived failover time by avoiding DNS propagation delays. Option A is incorrect because increasing the instance class improves performance but does not affect failover speed. Option B is incorrect because backup retention period is unrelated to failover latency. Option C is incorrect because Aurora MySQL is already Multi-AZ by design; enabling Multi-AZ is not a separate configuration step.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the instance class of the primary and replica instances.
Why it's wrong here
Increasing instance class affects performance, not failover speed. It does not reduce failover latency.
- ✗
Increase the backup retention period to 35 days.
Why it's wrong here
Backup retention period has no impact on failover latency. Failover time is not affected by backup configuration.
- ✗
Enable Multi-AZ on the DB cluster.
Why it's wrong here
Aurora MySQL is already Multi-AZ by default. Enabling Multi-AZ is not a separate configuration and does not reduce failover time.
- ✓
Configure the application to use the cluster endpoint with Aurora JDBC driver's fast failover feature.
Why this is correct
Using the cluster endpoint with the Aurora JDBC driver's fast failover feature reduces failover time by enabling the driver to quickly detect the new writer and reconnect without waiting for DNS propagation.
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JA
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.