DBS-C01 Management and Operations Practice Question
A company is using Amazon RDS for MySQL with a cross-Region read replica to support disaster recovery. The primary DB instance is in us-west-2, and the read replica is in us-east-1. The read replica is used for reporting and also serves as a failover target. The operations team notices that the read replica lag is consistently above 10 seconds during peak hours. What should the team do to reduce replica lag?
⚠ Common exam trap
Candidates often think enabling Multi-AZ on the primary will reduce replica lag, but Multi-AZ only provides synchronous replication within the same Region and does not affect cross-Region asynchronous replication performance.
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
✓
Increase the DB instance class of the read replica.
Increasing the DB instance class of the read replica provides more CPU and memory resources, which allows the replica to apply changes from the binary log more quickly. Cross-Region replication lag is often caused by the replica being unable to keep up with the write rate on the primary, so scaling up the replica directly addresses the bottleneck in applying binlog events.
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 DB instance class of the read replica.
Why this is correct
A larger instance class can process replication events faster.
- ✗
Enable Multi-AZ on the primary DB instance.
Why it's wrong here
Multi-AZ provides high availability, not replication performance.
- ✗
Increase the backup retention period for the primary DB instance.
Why it's wrong here
Backup retention does not affect replica lag.
- ✗
Disable binary logging (binlog) on the primary DB instance.
Why it's wrong here
Binary logging is required for replication.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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