AWS Certified Solutions Architect - Associate
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A company runs a fleet of web servers using an Amazon RDS for PostgreSQL DB instance. After a routine compliance check, the company sets a standard that requires a recovery point objective (RPO) of less than 1 second for all its production databases.
Which solution meets these requirements?
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UAnonymous
A
Enable a Multi-AZ deployment for the DB instance.
B
Enable auto scaling for the DB instance in one Availability Zone.
C
Configure the DB instance in one Availability Zone, and create multiple read replicas in a separate Availability Zone.
D
Configure the DB instance in one Availability Zone, and configure AWS Database Migration Service (AWS DMS) change data capture (CDC) tasks.
Explanation:
Explanation
Correct Answer: A - Enable a Multi-AZ deployment for the DB instance.
Why this is correct:
- Multi-AZ RDS deployment provides synchronous replication to a standby replica in a different Availability Zone.
- The Recovery Point Objective (RPO) measures the maximum acceptable amount of data loss measured in time. For Multi-AZ deployments, the RPO is typically less than 1 second because:
- Data is synchronously replicated to the standby instance
- In case of primary instance failure, the standby instance is promoted with minimal data loss
- The replication lag is minimal (near-zero)
Why other options are incorrect:
B. Enable auto scaling for the DB instance in one Availability Zone.
- Auto scaling helps with performance scaling but doesn't provide disaster recovery capabilities
- RPO would be much higher (potentially hours or days depending on backup frequency)
C. Configure the DB instance in one Availability Zone, and create multiple read replicas in a separate Availability Zone.
- Read replicas in RDS use asynchronous replication, which means there's replication lag
- RPO would be measured in seconds or minutes depending on replication lag, not less than 1 second
- Read replicas are primarily for read scaling, not for disaster recovery with strict RPO requirements
D. Configure the DB instance in one Availability Zone, and configure AWS Database Migration Service (AWS DMS) change data capture (CDC) tasks.
- DMS CDC replicates data to other targets but with some latency
- While DMS can provide near-real-time replication, it's not guaranteed to be less than 1 second RPO
- DMS is more for data migration and ongoing replication between different database engines, not for primary disaster recovery with strict RPO requirements
Key AWS Concepts:
- Multi-AZ RDS: Provides high availability and failover capability with synchronous replication
- RPO (Recovery Point Objective): Maximum acceptable data loss measured in time
- RTO (Recovery Time Objective): Maximum acceptable downtime
- For strict RPO requirements (<1 second), synchronous replication solutions like Multi-AZ RDS are required
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