Amazon RDS interview questions

36. How can I scale my DB instance beyond the largest DB instance class and maximum storage capacity ?
If the application requires more compute resources than the largest DB instance class or more storage than the maximum allocation, you can implement partitioning, thereby spreading your data across multiple DB instances.

37. What is Amazon RDS General Purpose (SSD) storage ?
Amazon RDS General Purpose (SSD) Storage is suitable for a broad range of database workloads that have moderate I/O requirements. With the baseline of 3 IOPS/GB and ability to burst up to 3,000 IOPS, this storage option provides predictable performance to meet the needs of most applications.

38. How are reserved instances different from on-demand DB instances ?
Functionally, reserved instances and on-demand DB instances are exactly the same. The only difference is how your DB instance(s) are billed: With Reserved Instances, you purchase a one or three year reservation and in return receive a lower effective hourly usage rate (compared with on-demand DB instances) for the duration of the term. Unless you purchase reserved instances in a Region, all DB instances will be billed at on-demand hourly rates.

39. What happens to my backups and DB snapshots if I delete my DB instance ?
When you delete a DB instance, you can create a final DB snapshot upon deletion; if you do, you can use this DB snapshot to restore the deleted DB instance at a later date. Amazon RDS retains this final user-created DB snapshot along with all other manually created DB snapshots after the DB instance is deleted.

40. What is Amazon Virtual Private Cloud (VPC) and how does it work with Amazon RDS ?
Amazon VPC lets you create a virtual networking environment in a private, isolated section of the AWS cloud, where you can exercise complete control over aspects such as private IP address ranges, subnets, routing tables and network gateways. With Amazon VPC, you can define a virtual network topology and customize the network configuration to closely resemble a traditional IP network that you might operate in your own datacenter.

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