The Oracle database listening service is Oracle Net Listener (ONL). It is responsible for: client connection management, listening for connection requests, verification and establishment of secure sessions, forwarding requests to database instances, session management, load balancing, monitoring instance availability and troubleshooting
Oracle database listening service is Oracle Net Listener (ONL)
Oracle Net Listener (ONL) is Oracle database listening service, which provides a middle layer for clients to connect to the database. It is responsible for:
Client connection management
- Listen for connection requests from clients
- Verify client connections and establish secure sessions
- Forward client requests to the appropriate database instance
Session management
- Maintain sessions between clients and database instances
- Handle session requests, such as creation, modification, and termination
- Manage session state and authentication information
Load balancing
- Distribute client requests to multiple database instances to optimize load
- Monitor instance availability and performance and reroute requests if problems occur
Troubleshooting
- Detect database instance failure and report to the client
- Try to reconnect to the failed instance and restore the connection after success
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