Network connections
Oracle Net Services is Oracle’s mechanism for interfacing with the communication protocols used by the networks that facilitate distributed processing and distributed database. Oracle Net Service supports communications on all major network protocols, including TCP/IP, HTTP, FTP and WebDAV.
Oracle Net, a component of Oracle Net Services, enables a network session from a client application to an Oracle database server. Once a network session is established, Oracle Net acts as the data courier for both the client application and the database server. It establishes and maintains the connection between the client application and database server, as well as exchanges messages between them. Oracle Net can perform these jobs because it is located on each computer in the network.
Starting up the database
Three steps to starting an Oracle database:
1. Start an instance
2. Mount the database
3. Open the database