DBS-C01 Management and Operations Practice Question
A database specialist is troubleshooting a performance issue on an Amazon Aurora MySQL DB cluster. The cluster has a primary instance and two Aurora Replicas. The application is experiencing high read latency. Which THREE actions should the specialist take to identify the cause?
⚠ Common exam trap
It's easy for candidates to confuse write latency on the primary with read latency on replicas, or assume scaling the replica size is a diagnostic step rather than a remediation, leading them to select Option A or B instead of focusing on monitoring and analysis metrics.
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
✓
Check the Performance Insights for the Aurora Replicas to identify long-running queries.
Performance Insights provides a detailed view of database load, including wait events, SQL queries, and host-level metrics, which can pinpoint long-running queries causing high read latency on the Aurora Replicas. By analyzing the top SQL statements and their execution plans, the specialist can identify inefficient queries or contention issues that degrade read performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check the Write Latency metric on the primary instance.
Why it's wrong here
Write latency does not directly affect read latency.
- ✗
Increase the instance size of the Aurora Replicas.
Why it's wrong here
This is a remediation step, not a diagnostic one.
- ✓
Check the Performance Insights for the Aurora Replicas to identify long-running queries.
Why this is correct
Long-running queries can cause read latency.
- ✓
Monitor the Aurora ReplicaLag metric in Amazon CloudWatch.
Why this is correct
High replicaLag indicates replication delay causing stale reads.
- ✓
Evaluate the DB Connection Count metric to see if the replicas are overloaded.
Why this is correct
High connection counts can overload replicas and increase latency.
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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.