Question 1,141 of 1,711
DEA-C01 Data Store Management Practice Question
A data engineer needs to set up a new Amazon RDS for PostgreSQL database for a production workload. The database must be highly available and resilient to a single Availability Zone failure. Which configuration should the engineer choose?
⚠ Common exam trap
It's easy for candidates to confuse Multi-AZ with read replicas, assuming that a read replica can serve as a failover target, but in RDS PostgreSQL, read replicas are asynchronous and require manual promotion, making them unsuitable for automatic high availability against AZ failures.
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
✓
Multi-AZ deployment with one standby in a different AZ
A Multi-AZ deployment for Amazon RDS PostgreSQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. This configuration provides automatic failover in the event of an AZ failure, ensuring high availability and resilience without manual intervention. The synchronous replication ensures zero data loss during failover, which is critical for production 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.
- ✗
Single-AZ with automated backups
Why it's wrong here
Does not protect against AZ failure.
- ✓
Multi-AZ deployment with one standby in a different AZ
Why this is correct
Provides automatic failover and high availability.
- ✗
Multi-AZ with two readable standbys
Why it's wrong here
Not a supported configuration; Multi-AZ has one standby.
- ✗
Single-AZ with a read replica
Why it's wrong here
Read replica does not provide automatic failover.
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Same concept, more angles
1 more way this is tested on DEA-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A data engineering team is migrating a MySQL database to Amazon RDS for MySQL. They need to ensure high availability and automated failover. Which THREE configurations should they implement?
easy- A.Enable Enhanced Monitoring.
- ✓ B.Enable automated backups with a retention period.
- ✓ C.Enable Multi-AZ deployment.
- ✓ D.Configure a DB subnet group with subnets in at least two Availability Zones.
- E.Create a read replica in a different region.
Why B: Automated backups with a retention period enable point-in-time recovery (PITR) and are required for Multi-AZ failover to function properly. RDS uses automated backups to keep the standby instance synchronized and to support recovery after a failover event.
Last reviewed: Jul 4, 2026
This DEA-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 DEA-C01 exam.
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