rds
Table of Contents
Relational Database Service
关系型数据库，mysql/postgres为主，可管理，性能可预测（花钱买），无缝集成ec2（低延迟连接）
5 Read Replicas for MySQL and Postgres SQL
异步复制数据
SQL vs NoSQL
DB Instances
Isolated database env
Can contain mulple user created databases
Backups works are enabled by default
Restore your database to a point in time
RDS Security
Run DB instance in a VPC
Use IAM policies for accessing
Use Security groups
Use SSL connection