I'm using Oracle RDS in the classic configuration pre-VPC era.
I have created rules on the RDS security group to allow EC2 public IPs from VPC instances to access the DB.
I have used all the 20 allowed IP address and referencing other SGs from RDS SG doesn't seem to work.
So, i need to move my RDS oracle instance from EC2-Classic to a VPC, i understand the overall procedure but i have some important questions not found on AWS docs:
Is there any downtime ? If so, how much?
The database endpoint will change after the migration?
EC2-VPC instances could still using the db endpoint transparently?
If anyone already did this migration i would like to hear the overall experience.