Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 575 discussion

RDS Multi-AZ DB cluster deployments provide high availability, automatic failover, and increased read capacity. A multi-AZ cluster automatically handles replicating data across AZs in a single region. This maintains operational efficiency as it is natively managed by RDS without needing external replication. DynamoDB global tables involve complex provisioning and requires app changes. RDS read replicas require manual setup and management of replication. RDS Multi-AZ clustering is purpose-built by AWS for HA PostgreSQL deployments and balancing read workloads.

DB cluster deployment can scale read workloads by adding read replicas. This provides increased capacity for read workloads without impacting the write workload.

"A Multi-AZ DB cluster deployment is a semisynchronous, high availability deployment mode of Amazon RDS with two readable replica DB instances."

multi-AZ addresses both HA & increased read capacity with synchronous data replication between main DB & standby. Read replica is not enough because only increased read capacity not enabling HA, besides the data replication is async

https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/multi-az-db-clusters-concepts.html "A Multi-AZ DB cluster deployment is a semisynchronous, high availability deployment mode of Amazon RDS with two readable standby DB instances" A: DynamoDB is not Postgres B: Although HA is achieve but it does not increase the read capacity as much as C without additional operational complexity D: Cross region is not a requirement and won't solve the same region HA or read issues

Multi-AZ DB Cluster Deployment = Aurora

Multi-AZ DB cluster deployments provides two readable DB instances if you need additional read capacity

C is correct

Multi-AZ DB clusters provide high availability, increased capacity for read workloads, and lower write latency when compared to Multi-AZ DB instance deployments.

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