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Question 1
What is the primary purpose of RDS Multi-AZ deployments?
Answer: Multi-AZ provides high availability and automatic failover to a standby replica in a different Availability Zone. The standby is synchronously replicated and not used for read traffic.
Question 2
Which RDS feature allows you to offload read traffic from the primary database instance?
Answer: Read Replicas allow you to create one or more replicas of a source DB instance for read-heavy workloads. They use asynchronous replication and can be promoted to standalone instances.
Question 3
What type of replication does RDS Multi-AZ use, and how does it differ from Read Replicas?
Answer: Multi-AZ uses synchronous replication, ensuring zero data loss during failover. Read Replicas use asynchronous replication, which may result in slight replication lag.
Question 4
How many Read Replicas can you create for a standard RDS MySQL or PostgreSQL instance?
Answer: You can create up to 5 Read Replicas for a standard RDS MySQL or PostgreSQL instance. Read Replicas can also be created in different AWS regions.
Question 5
What happens to the RDS database endpoint during a Multi-AZ failover?
Answer: The DNS endpoint remains the same but automatically resolves to the standby instance, which is promoted to primary. Applications reconnect using the same connection string with no manual intervention.