DBS-C01 Management and Operations Practice Question
A company uses Amazon RDS for PostgreSQL with Multi-AZ deployment. They experience increased write latency during peak hours. The DB instance size is db.r5.large. Which action would MOST effectively reduce write latency?
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
✓
Disable the Multi-AZ feature and use asynchronous replication with a read replica for failover.
Multi-AZ deployments maintain a synchronous standby replica, which adds write latency because the primary must wait for the standby to acknowledge writes. Disabling Multi-AZ and using asynchronous replication to a read replica eliminates this synchronous overhead, allowing writes to complete faster. Option A increases instance size but doesn't address synchronous replication overhead; option C (synchronous_commit off) risks data loss and is not recommended; option D adds another standby, increasing overhead.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch to a db.r5.xlarge instance type.
Why it's wrong here
Scaling up may help but doesn't address the replication overhead directly.
- ✓
Disable the Multi-AZ feature and use asynchronous replication with a read replica for failover.
Why this is correct
Asynchronous replication reduces write latency; read replica can be promoted for failover.
- ✗
Enable the synchronous_commit parameter to 'off'.
Why it's wrong here
Setting synchronous_commit to off risks data loss; not recommended for production.
- ✗
Enable Multi-AZ with two standby replicas.
Why it's wrong here
Adding more standbys increases synchronous replication overhead, worsening 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.