DBS-C01 Monitoring and Troubleshooting Practice Question
Which TWO actions can help reduce Amazon RDS for MySQL replication lag between a primary instance and a read replica? (Choose 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
✓
Reduce the number of write-heavy DML statements on the primary.
Reducing write-heavy DML on the primary (Option B) decreases the volume of changes to be replicated, directly reducing lag. Increasing the instance size of the read replica (Option D) provides more CPU and memory resources for applying changes from the binary log. Option A is incorrect because increasing allocated storage does not improve the replica's ability to apply changes; it only increases storage capacity. Option C is incorrect because enabling Multi-AZ on the primary provides high availability but does not reduce replication lag. Option E is incorrect because binary logging is required for replication; disabling it would break replication.
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 allocated storage for the read replica.
Why it's wrong here
Storage size does not directly affect replication lag.
- ✓
Reduce the number of write-heavy DML statements on the primary.
Why this is correct
Fewer changes to replicate means less lag.
- ✗
Enable Multi-AZ on the primary instance.
Why it's wrong here
Multi-AZ provides high availability, not lag reduction.
- ✓
Increase the instance size of the read replica.
Why this is correct
A larger replica can apply changes faster.
- ✗
Disable binary logging on the primary instance.
Why it's wrong here
Binary logging is required for 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.