A service-oriented architecture is equivalent to a monolithic system. All functions are in one system. When a function is highly concurrent, this monolithic architecture will be difficult to cope with. Each microservice has a relatively independent function. If a module has a high concurrency, the function of the module can be enhanced without modifying the framework of the entire system.
In general, the functions of microservice applications and holistic applications are the same, but the underlying architecture is different. Microservice architecture splits the whole architecture. For example, in the e-commerce website, the order module adopts the micro service architecture, which can allocate more resources and have faster database query function, so as to ensure that users' orders can be submitted to the e-commerce website. In the monolith-based system, all modules have the same resources and are equal. In the microservice architecture, there can be different resource allocation according to the required functions.