Topic 1 Question 241
An online learning company is migrating to the AWS Cloud. The company maintains its student records in a PostgreSQL database. The company needs a solution in which its data is available and online across multiple AWS Regions at all times.
Which solution will meet these requirements with the LEAST amount of operational overhead?
Migrate the PostgreSQL database to a PostgreSQL cluster on Amazon EC2 instances.
Migrate the PostgreSQL database to an Amazon RDS for PostgreSQL DB instance with the Multi-AZ feature turned on.
Migrate the PostgreSQL database to an Amazon RDS for PostgreSQL DB instance. Create a read replica in another Region.
Migrate the PostgreSQL database to an Amazon RDS for PostgreSQL DB instance. Set up DB snapshots to be copied to another Region.
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コメント(17)
- 正解だと思う選択肢: C
Multi az is not the same as multi regional
👍 12Steve_45426362023/03/01 - 正解だと思う選択肢: B
B: Amazon RDS Multi-AZ feature automatically creates a synchronous replica in another availability zone and failover to the replica in the event of an outage. This will provide high availability and data durability across multiple AWS regions which fit the requirements.
Though C may sound good, it in fact requires manual management and monitoring of the replication process due to the fact that Amazon RDS read replicas are asynchronous, meaning there is a delay between the primary and read replica. Therefore, there will be a need to ensure that the read replica is constantly up-to-date and someone still has to fix any read replica errors during the replication process which may cause data inconsistency. Lastly, you still have to configure additional steps to make it fail over to the read replica.
👍 10alexleely2023/01/21 - 正解だと思う選択肢: C
Question asks for "available and online across multiple AWS Regions at all times". Multi-AZ is only within one region. Database can be replicated cross-region.
👍 6dark_firzen2023/01/28
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