Amazon RDS Multi-AZ Deployment for High Availability
Which feature of Amazon RDS provides the ability to automatically create a primary database instance and to synchronously replicate data to an instance in another Availability Zone?
Community Votes
100% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
The question tests knowledge of RDS data replication methods, with the common trap being confusion between asynchronous Read Replicas and synchronous Multi-AZ deployments.
This question tests the specific capabilities of Amazon RDS regarding high availability and disaster recovery. It establishes that Multi-AZ deployment is the correct feature for synchronous replication across Availability Zones.
Candidates often choose Read replicas (A) because they also provide copies of the database, but fail to note that Read Replicas replicate asynchronously, not synchronously as required by the prompt.
Community Discussion (3 comments)
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Expert Analysis
Why the Answer Is Correct
Multi-AZ deployment is designed specifically for high availability and fault tolerance. When you enable Multi-AZ, Amazon RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. This ensures that if the primary instance fails, the system automatically fails over to the standby without manual intervention, maintaining data consistency through synchronous replication.Why the Other Options Are Wrong
Read replicas (A) are used for scaling read operations and can be located in the same or different regions, but they replicate data asynchronously, which means there can be a lag. Blue/green deployment (B) is used for zero-downtime migrations and updates, involving parallel environments rather than automatic failover replication. Reserved Instances (D) are a billing discount mechanism, not a technical feature for data replication or availability.Community Comment Notes
The community consensus strongly supports option C. As one commenter noted, "Key is synchronously as Read replicas are Asynch," highlighting the critical distinction in replication timing. Another user emphasized the keyword "Automatically create..." as indicative of Multi-AZ functionality. The votes were unanimous, reflecting a clear understanding of this core AWS concept.Exam Strategy
Focus on the keywords 'synchronously' and 'another Availability Zone' when analyzing RDS questions. These terms immediately point to Multi-AZ deployment, distinguishing it from Read Replicas which are asynchronous.
Frequently Asked Questions
Why isn't Read Replica the answer for synchronous replication?
Read Replicas replicate data asynchronously, meaning changes are applied after they occur on the source. Multi-AZ uses synchronous replication to ensure zero data loss during failover.
What is the primary purpose of Blue/Green Deployment?
Blue/Green Deployment is used for seamless application updates and migrations by running two identical environments, switching traffic only when ready, not for database replication.
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