ORACLE FAL_CLIENT and FAL_SERVER explained

FAL_CLIENT and FAL_SERVER are initialization parameters used to configure log gap detection and resolution at the standby database side of a physical database configuration. This functionality is provided by log apply services and is used by the physical standby database to manage the detection and resolution of archived redo logs.

FAL_CLIENT and FAL_SERVER only need to be defined in the initialization parameter file for the standby database(s). It is possible; however, to define these two parameters in the initialization parameter for the primary database server to ease the amount of work that would need to be performed if the primary database were required to transition its role.


Sample setup:

In Primary site:

FAL_SERVER=STANDBY
FAL_CLIENT=PRIMARY

In Standby site:

FAL_SERVER=PRIMARY
FAL_CLIENT=STANDBY