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DBS-C01 Deployment and Migration Practice Question

Network Topology
Command: aws rds describe-db-instancesdb-instance-identifier mydbRefer to the exhibit.Output:"DBInstances": ["DBInstanceIdentifier": "mydb","DBInstanceClass": "db.r5.large","Engine": "mysql","DBInstanceStatus": "available","MultiAZ": false,"Endpoint": {"Address": "mydb.abcdefghijk.us-east-1.rds.amazonaws.com","Port": 3306,"HostedZoneId": "Z1PVIF0JZ7T2V"},"ReadReplicaSourceDBInstanceIdentifier": null,"ReadReplicaDBInstanceIdentifiers": []

Refer to the exhibit. A developer runs the command against an RDS MySQL instance. The application team reports that the database is experiencing high read latency during peak hours. The database is not currently in Multi-AZ. What is the MOST cost-effective way to reduce read latency?

⚠ Common exam trap

Many exam-takers confuse Multi-AZ with read scaling, assuming the standby can serve reads, but in RDS MySQL Multi-AZ, the standby is only used for failover and cannot accept connections.

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

✓

Create a read replica in the same region.

Creating a read replica in the same region offloads read traffic from the primary RDS MySQL instance, reducing read latency during peak hours without incurring the cost of a larger instance or a full Aurora migration. Read replicas are asynchronous and can serve SELECT queries, providing a cost-effective scaling solution for read-heavy workloads.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Enable Multi-AZ to distribute reads to the standby.

    Why it's wrong here

    Multi-AZ standby replicas do not serve read traffic; they only maintain a synchronised copy for failover, so enabling Multi-AZ would not reduce read latency. This option is tempting because Multi-AZ is often associated with high availability, and in a different scenario—such as needing automatic failover after an outage—it would be the correct choice.

  • ✗

    Upgrade the instance to db.r5.2xlarge.

    Why it's wrong here

    More expensive than adding a read replica.

  • ✗

    Migrate to Aurora MySQL with a read replica.

    Why it's wrong here

    Migration effort is high; not necessarily cost-effective.

  • ✓

    Create a read replica in the same region.

    Why this is correct

    Offloads read traffic; cost-effective.

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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.