Service-oriented Architecture (SOA)

Microservice architecture

Focuses on imperative programming

Focuses on a responsive actor programming style

Its models tend to have an outsized relational database

Microservices frequently use NoSQL or micro-SQL databases (which can be connected to conventional databases)

In SOA, ESB implements communication between mutually-interacting software

In microservices, independent processes communicate with each other using language-agnostic APIs

It is easier to deploy new versions of services frequently, or scale a service independently

Services can operate and be deployed independently of other services

SOA has ESB, which could be a single point of failure that impacts the entire application

Microservice architecture has a much better fault-tolerance system

Data storage is shared between services

Each service has its own data storage