oracle 12c 新增加后台进程监听注册进程:LREG

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Service registration enables the listener to determine whether a database service and its service handlers are available. A service handler is a dedicated server process or dispatcher that acts as a connection point to a database. During registration, the LREG process provides the listener with the instance name, database service names, and the type and addresses of service handlers. This information enables the listener to start a service handler when a client request arrives.

在12c以前,该功能是由pmon来负责的,从12c 开始,单独新增加一个进程lreg来负责