Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 501 discussion

An instance maintenance policy in the context of AWS Auto Scaling governs how instances are handled before they are fully launched and available for use. It defines the actions that need to occur (such as running a user data script, applying patches, or installing software) to ensure the instance is ready. When combined with features like warm pools, maintenance policies can ensure instances are prepared in advance and reduce delays during scaling events. These policies help ensure instances are fully initialized before serving traffic.

@songilly provided an exhaustive comment explaining why B is the only viable answer

Due to the link in songilly's comment, which clearly states D is out. I am almost sure they were looking for knowledge of "warm pools", but here is another poorly written AWS question

No mention of any peak period so there’s no way to use predictive scaling The problem occurs cause the VMs take too long to boot up and be ready to accept requests, the only thing to do is to have them already “warm”. And I’ve never heard of a “maintenance mode” and I know that lifecycle hooks are a common practice with ASGs Warm pools Lifecycle hooks are how

You can't use a warm pool in an Auto Scaling group with mixed instances policy or has spot instances: https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-warm-pools.html So not sure how D can be write. Although B doesn't seem great it might be the only viable option.

Agree with D There is no mention of predictable peak period. Since there's a known metric where user experience skpwness, dynamic scaling should be used. https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scale-based-on-demand.html#:~:text=A%20dynamic%20scaling%20policy%20instructs,CloudWatch%20alarm%20is%20in%20ALARM. Use warm pool to reduce latency and cost of unnecessary standby instance. https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-warm-pools.html Use lifecycle hook due to the need to install custom packages https://docs.aws.amazon.com/autoscaling/ec2/userguide/lifecycle-hooks.html More reference: https://aws.amazon.com/blogs/compute/introducing-instance-maintenance-policy-for-amazon-ec2-auto-scaling/

D is correcyt

Answer : D

Answer D

B AWS Database Migration Service can convert Oracle and SQL Server to Amazon RDS for MySQL and Amazon RDS for PostgreSQL stored procedures. D AWS Database Migration Service (AWS DMS) performs data migration. The answer is DB.