Monolithic architecture - monolithic application is a single unified software application which is self-contained and independent from other applications, but typically lacks flexibility.
Monolithic architecture - Design an architecture that structures the application as a single deployable/executable component that uses a single database.
This is an architecture with single logical storage for data and loosely coupled services. Communications between services should be organized through data layer.
"Data-oriented architecture" - means, think about data and storage first and then about services to process this data. This is true for the applications where data is the main value.
Then our application consists of a set of microservices it would be a wrong decision to implement interactions between clients and services directly as drawn on diagram below