Describes the cause and action for error messages.
Error Message(English)：
rds pricing
Amazon RDS for Orac...
https://aws.amazon.com/jp/rds/oracle/pricing/
Amazon RDS for Post...
https://aws.amazon.com/jp/rds/postgresql/pricing/
Amazon RDS Instance Types - Amazon Web Services
https://aws.amazon.com/rds/instance-types/
Amazon RDS Reserved Instances ? Amazon Web Services
https://aws.amazon.com/rds/reserved-instances/
Amazon RDS Free Tier ? Amazon Web Services (AWS) - Amazon.com
https://aws.amazon.com/rds/free/
AWS 月額料金チートシート - Qiita
https://qiita.com/jyotti/items/d47b52fa13d12476406f
Amazon RDS pricing - Stack Overflow
https://stackoverflow.com/questions/43496707/amazon-rds-pricing
RDS for MariaDB 気になる料金は？ #reinvent ｜ DevelopersIO
https://dev.classmethod.jp/cloud/aws/rds-for-mariadb-pricing/
Exploring AWS RDS Pricing and Features - ParkMyCloud
https://www.parkmycloud.com/blog/aws-rds-pricing/