DB Parameter Groups

• DB Engines configuration can be controlled using parameter groups
• For every engine the parameters will be different, when you create a database, rds will use the default parameters to create the db

DB Subnet Groups

• DB Subnets Groups allow you to choose the VPC and the subnet ids by selecting the needed AZ’s

DB OptionS Group

• Some Db Engines they offer some additional features and these can be used in RDS using option Groups