Summary of basic knowledge of oracle database

Oracle Database is a reliable, scalable and feature-rich relational database management system (RDBMS). Its architecture follows the client-server model, including server-side components (Oracle Net), instances, shared memory areas (SGAs), background processes, and database files that store data. Basic concepts include tables, rows, columns, primary keys, foreign keys, indexes and cursors. The database is known for its advantages such as high availability, big data support, rich features, strong security and ease of use.

Oracle Database Basics

What is an Oracle database?

Oracle Database is a relational database management system (RDBMS) that is widely used to store, manage and retrieve data. It is known for its reliability, scalability and feature richness.

Oracle Database Schema

Oracle databases follow a client-server architecture and include the following components:

• Oracle Net (server side): handles client connection requests and manages its communication with the database.
• Oracle instance: A process running on the server that handles database connections, data management, and other tasks.
• System Global Area (SGA): The shared memory area of ​​the instance, storing database buffers, program codes, and control information.
• Background process: Perform background tasks such as logging, recovery, and memory management.
• Database file: A binary file that stores actual data.

Basic concepts of Oracle database

• Table: A collection of relevant data.
• Row: A record in the table.
• Column: Data fields in the table.
• Primary key: A value or set of values ​​that uniquely identifies each row.
• Foreign key: The value pointing to another table primary key.
• Index: A hierarchical structure used to quickly find data.
• Cursor: Pointers used to traverse records in a table.
• Transaction: A set of database operations to ensure atomicity, consistency, isolation and durability.

Advantages of Oracle Database

• Reliability: High availability and data integrity.
• Scalability: Supports large-scale datasets and concurrent users.
• Feature Rich: Provides a wide range of data types, indexing techniques and analysis tools.
• Security: Powerful security features including user permission management and data encryption.
• Ease of use: Intuitive graphical user interface (GUI) and SQL programming language.

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