02. RDS Databases (Part One)

Persisting Data

• Most applications need their data to persist and not be lost, which requires a database.
• We don't want a database to be a single point of failure, so we'll use resources that are designed for reliability. For example, RDS for the database, and S3 for the filestore.
• Relational Database Service (RDS): AWS service for creating databases.

Choosing a database

• AWS Aurora and MySQL have no additional licensing costs. Microsoft SQL Server will have additional licensing costs.

Mult-AZ deployment

• If you are using a database in a development environment, you can save money by using a single Availability Zone.
• For production databases, use multiple AZs for reliability. If one AZ fails, the other one will still be available.

A single RDS Server can host multiple databases

• Note that you can use a single RDS database that hosts multiple applications, each with different logins and users for those applications. In other words, you don’t need to create a separate RDS service for each application.