1. 개요

• Storing data on disk (EFS, EBS, EC2 Instance Store, S3) can have its limits

• Sometimes, you want to store data in a database…

• You can structure the data

• You build indexes to efficiently query / search through the data

• You define relationships between your datasets

• Databases are optimized for a purpose and come with different features, shapes and constraints

2. Relational Databases

• Looks just like Excel spreadsheets, with links between them!
• Can use the SQL language to perform queries / lookups

3. NoSQL Databases

• NoSQL = non-SQL = non relational databases
• NoSQL databases are purpose built for specific data models and have flexible schemas for building modern applications