Design Microservices Architecture with Patterns and Principles - Best Practices for CQRS and Instagram Database Architec

The video tutorial discusses the CQRS pattern and its application in Instagram's database architecture. It covers best practices for isolating commands and queries, such as using separate physical database servers for read and write operations. The tutorial explains the use of different database technologies, like NoSQL for reading and relational databases for CRUD operations. Instagram's database systems, including PostgreSQL for user information and Cassandra for user stories, are highlighted. The architectures of PostgreSQL and Cassandra, including master-replica and masterless designs, are also explored.

What is a key best practice when implementing CQRS?

• Using a single database for both read and write operations

• Separating read and write databases with two physical servers

• Using only NoSQL databases for all operations

• Combining command and query operations in one database

Which database does Instagram use for storing user stories?

• MySQL

• Cassandra

• MongoDB

• PostgreSQL

What type of data is stored in Instagram's PostgreSQL database?

• Video content

• Image metadata

• User information and updates

• User stories

How does Instagram's PostgreSQL database handle write operations?

• By distributing writes across all nodes

• With a masterless architecture

• Through a master database server

• Using a peer-to-peer architecture

What is a characteristic of Cassandra's architecture used by Instagram?

• Centralized control

• Masterless architecture

• Single-node operation

• Master-replica setup