DBS-C01 Monitoring and Troubleshooting Practice Question
A database specialist is troubleshooting an Amazon RDS for PostgreSQL instance that has high replication lag between the primary and a read replica. Which TWO metrics should the specialist review to identify the cause? (Select TWO.)
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
✓
ReadIOPS on the replica
High ReadIOPS on the read replica can indicate heavy read activity, which may cause replication lag as the replica struggles to apply changes fast enough. Option D is correct because ReplicaLag directly measures the time delay between the primary and replica, confirming the presence of lag. Option A is incorrect because WriteIOPS on the primary reflects write workload, not lag cause. Option C is incorrect because DatabaseConnections do not directly affect replication lag. Option E is incorrect because NetworkThroughput is not a metric that directly indicates replication lag; it could be a factor but is not a standard RDS metric for diagnosing lag.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
WriteIOPS on the primary
Why it's wrong here
WriteIOPS on primary does not directly indicate replica lag.
- ✓
ReadIOPS on the replica
Why this is correct
High read activity on the replica can cause lag.
- ✗
DatabaseConnections on the primary
Why it's wrong here
Connections are not directly related to replication lag.
- ✓
ReplicaLag
Why this is correct
Directly measures the replication lag in seconds.
- ✗
NetworkThroughput between primary and replica
Why it's wrong here
Not a standard CloudWatch metric for RDS replication.
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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.