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.
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