Oracle Database Architecture Explained

The architecture of an Oracle database is typically divided into three layers: physical layer, logical layer, and user layer.

1. The physical layer of a database, including its storage structure and file system, is the lowest level of the database. This layer is responsible for storing data on the hard disk and providing physical storage space management and data access control.
2. Logic Layer: The logic layer consists of the actual data and indexes of the database, as well as the logical structure of the database. This layer includes database objects such as tables, views, stored procedures, triggers, as well as components like the database engine and query optimizer.
3. User Layer: The user layer, consisting of database users and applications, is the top layer of the database. It includes database administrators, developers, and end users who interact with the database through SQL language and database interfaces.

In general, the architecture of the Oracle database is hierarchical, with layers ranging from the physical layer to the logical layer and then to the user layer. Each layer has its unique functions and responsibilities, collectively forming a complete database system.