Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 67 discussion

The problem only requires high availability, does not affect current traffic, and does not require improved read performance

I agree with chatGPT eliminating exaplanatin for B: Option B suggests using Amazon RDS with Multi-AZ and at least one standby replica. While Multi-AZ provides high availability by automatically replicating data to a standby replica in a different Availability Zone, it does not support read scaling. A standby replica is read-only, so it cannot be used to serve read traffic. Therefore, Option B does not meet the requirement of supporting high-read traffic from users in different locations.

It's B, Standby Replica has the benefits:- Amazon RDS Multi-AZ and Read Replicas maintain a copy of database but they are different in nature. Use Multi-AZ deployments for High Availability/Failover and Read Replicas for read scalability. Read replica is to increase performance and decrease load on main DB, see below. https://medium.com/awesome-cloud/aws-difference-between-multi-az-and-read-replicas-in-amazon-rds-60fe848ef53a

answer is a

i think "must not affect current traffic flow" means no performance degradation due to high read traffics, so its read replica?

Is there really a standby replica? What is a standby replica?

https://aws.amazon.com/blogs/database/readable-standby-instances-in-amazon-rds-multi-az-deployments-a-new-high-availability-option/#:~:text=The%20standby%20DB%20instances%20act,additional%20read%20replica%20DB%20instances.

I understand that when they say "high availability" it means automatic failover and only multi-AZ provide this feature. And when they say "must not affect current traffic flow" it means not redirect traffic to read replica... So I choose B.

Option A is most suitable among options but it does not address "must not affect the company's current traffic flow" requirement in Requirement: The database solution must support high availability and must not affect the company's current traffic flow"

okay, I read some document about the standby replica. It says " The standby replica in a Multi-AZ deployment cannot take on read requests. It is only meant for a failover and is not used for read purposes." So A is correct in this regard. because we need to access the replica for consistency when needed.

From the link provided in the suggested answer by the owner of this website, A is wrong, B is the right answer. In the link it says: "If it’s a Multi-AZ configuration, backups occur on the standby to reduce impact on the primary." https://aws.amazon.com/blogs/database/implementing-a-disaster-recovery-strategy-with-amazon-rds/

A is correct