What does an oracle database server consist of?

Oracle database server consists of seven main components: 1. Instance (manages connections and data processing); 2. Database (stores actual data); 3. SGA (caches data and code, improves performance); 4 . PGA (stores user session information); 5. Background process (performs key tasks); 6. Network service (handles connection and authentication); 7. Operating system (provides underlying resource management).

Oracle Database Server Composition

Oracle Database Server consists of the following components:

1. Instance

• Oracle instance is the memory structure when the database server is running.
• It is responsible for managing database connections, memory management and processing data.

2. Database

• The database contains the actual data, stored in groups called data files.
• It consists of schemas, tables, views and indexes.

3. System Global Area (SGA)

• SGA is a shared part of instance memory used to cache database data, code and control structures .
• It improves performance because frequently accessed data can be quickly retrieved from memory.

4. Program Global Area (PGA)

• The PGA is a dedicated memory area for each user session.
• It stores session specific information such as work area, temporary sort area and stack.

5. Background process

• The background process is the background program running by the oracle instance.
• They are responsible for performing critical tasks such as latch management, memory management, and logging.

6. Network Service

• Network service allows clients to connect to the database server through the network.
• It provides functions such as authentication, encryption and session management.

7. Operating system

• Oracle database server runs on the server operating system.
• The operating system provides underlying resource management and process scheduling.

The above is the detailed content of What does an oracle database server consist of?. For more information, please follow other related articles on the PHP Chinese website!