AWS Certified Developer Associate · Free Practice Question Medium
Question 44
As a Senior Developer, you manage 10 Amazon EC2 instances that make read-heavy database requests to the Amazon RDS for PostgreSQL. You need to make this architecture resilient for disaster recovery.
Which of the following features will help you prepare for database disaster recovery? (Select two)
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A
Use cross-Region Read Replicas
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B
Use RDS Provisioned IOPS (SSD) Storage in place of General Purpose (SSD) Storage
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C
Enable the automated backup feature of Amazon RDS in a multi-AZ deployment that creates backups in a single AWS Region
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D
Enable the automated backup feature of Amazon RDS in a multi-AZ deployment that creates backups across multiple Regions
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E
Use database cloning feature of the RDS DB cluster
Reveal correct answers
Correct answers: A, C
Explanation
Correct option:
Use cross-Region Read Replicas
In addition to using Read Replicas to reduce the load on your source DB instance, you can also use Read Replicas to implement a DR solution for your production DB environment. If the source DB instance fails, you can promote your Read Replica to a standalone source server. Read Replicas can also be created in a different Region than the source database. Using a cross-Region Read Replica can help ensure that you get back up and running if you experience a regional availability issue.
Enable the automated backup feature of Amazon RDS in a multi-AZ deployment that creates backups in a single AWS Region
Amazon RDS provides high availability and failover support for DB instances using Multi-AZ deployments. Amazon RDS uses several different technologies to provide failover support. Multi-AZ deployments for MariaDB, MySQL, Oracle, and PostgreSQL DB instances use Amazon's failover technology.
The automated backup feature of Amazon RDS enables point-in-time recovery for your database instance. Amazon RDS will backup your database and transaction logs and store both for a user-specified retention period. If it’s a Multi-AZ configuration, backups occur on the standby to reduce I/O impact on the primary. Automated backups are limited to a single AWS Region while manual snapshots and Read Replicas are supported across multiple Regions.
Incorrect options:
Enable the automated backup feature of Amazon RDS in a multi-AZ deployment that creates backups across multiple Regions - This is an incorrect statement. Automated backups are limited to a single AWS Region while manual snapshots and Read Replicas are supported across multiple Regions.
Use RDS Provisioned IOPS (SSD) Storage in place of General Purpose (SSD) Storage - Amazon RDS Provisioned IOPS Storage is an SSD-backed storage option designed to deliver fast, predictable, and consistent I/O performance. This storage type enhances the performance of the RDS database, but this isn't a disaster recovery option.
Use database cloning feature of the RDS DB cluster - This option has been added as a distractor. Database cloning is only available for Aurora and not for RDS.
References:
https://aws.amazon.com/rds/features/
https://aws.amazon.com/blogs/database/implementing-a-disaster-recovery-strategy-with-amazon-rds/
Discussion
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