Amazon RDS Multi-AZ for High Availability and Fault Tolerance
Short answer
C Use Amazon RDS with multiple Availability Zones to ensure high availability and automatic failover.
Question
Key Takeaways
The key insight is that while RDS provides automated backups, only the Multi-AZ deployment option ensures automatic failover and high availability during an AZ failure.
This question tests the correct configuration of Amazon RDS to achieve high availability and fault tolerance. The correct solution involves deploying the PostgreSQL database across multiple Availability Zones using the Multi-AZ feature.
Common mistake: Candidates often confuse RDS snapshots with high availability solutions. Snapshots are point-in-time backups used for recovery, not for active failover or maintaining service continuity during a zone outage.
Expert Analysis
Why the Answer Is Correct
Amazon RDS with multiple Availability Zones (Multi-AZ) is specifically designed to provide high availability and fault tolerance. In this configuration, AWS maintains a synchronous standby replica in a different Availability Zone. If the primary DB instance fails, RDS automatically detects the failure and fails over to the standby instance, typically within minutes, ensuring minimal downtime.
Why the Other Options Are Wrong
Option A is incorrect because a single Availability Zone creates a single point of failure; if that zone goes down, the database becomes unavailable. Option B, RDS snapshots, are asynchronous backups used for data restoration, not for real-time high availability or automatic failover. Option D, AWS Database Migration Service, is a tool for migrating databases between engines or platforms, not for hosting or ensuring the availability of a production database.
Community Comment Notes
The community consensus strongly supports Option C. As ShaiTay noted, "highly available = multiple AZs". AravindrajG emphasized that Multi-AZ allows users to access the database from another AZ if one fails, highlighting it as a best practice for high availability. Other commenters simply confirmed the answer based on these keywords.
Exam Strategy
When you see requirements for 'high availability' or 'fault tolerance' in AWS exams, immediately look for Multi-AZ deployments for managed services like RDS or Aurora. Do not select backup options unless the question specifically asks about disaster recovery points or data retention.
Frequently Asked Questions
Why aren't RDS snapshots sufficient for high availability?
Does Multi-AZ improve performance?
Community Votes
100% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 4 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 4
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AravindrajG 👍 1 Answered CKey Word: High available and fault tolerance RDS configured with Multiple Availability zones (Multi-AZ),If one AZ is fail or not accessible user can access from another AZ RDS database. It is one of the best practice to high availability of RDS. Answer is C. Amazon RDS with Multiple Availability Zones
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ShaiTay 👍 1 Answered CC. Amazon RDS with multiple Availability Zones - highly available = multiple AZs
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d00b229 👍 1C. Amazon RDS with multiple Availability Zones
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its_tima 👍 1key words: highly available*
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