AWS Classroomnotes 10/Dec/2022

Storage for AWS RDS

• AWS RDS stores the data in Virtual Hard disks which are referred as EBS Volumes.
• There are 4 disk types which are available
  • General purpose SSD: This is like an SSD on your laptop (decent speed)
    • v2
    • v3
  • Provisioned IOPS: Set the speed of your ssd disk
• Disk speed is measured in IOPS
• Lets create a pricing estimate with all the 3 disk types Refer Here
• GP2
  
• GP3
  
• Provisioned IOPS
  
• Disks in AWS for RDS support autoscaling i.e. we can set the maxium size of the disk and also start size.
  

Problem 1

• Lots of Reads and Writes on the RDS database increasing the need for resources which in turn increases cost
  
• To solve this we create a read-replica which allows only read operations. All the writes from your application are happening on primary database and all the reads from the replica
  
• AWS allows creating read replicas from primary database in any region.