ORACLE 12C : Listener service registration
With previous releases PMON (Process Monitor) was responsible for registering database services to the Listener. Starting from Oracle 12C there is a change in architecture with respect to the service registration in Oracle Database Release 12c. Oracle has introduced a new mandatory background process dedicated for “database service registration to the Listener” and named LREG (Listener Registration Process). The listener registration process (LREG) registers information about the database instance and dispatcher processes with the Oracle Net listener (see “The Oracle Net Listener”). When an instance starts, LREG polls the listener to determine whether it is running. If the listener is running,...