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The key advantage for logical standby databases is that , even while they're in applied mode.
That is, they can be used to generate reports and the like. Also, additional indexes, materialized views and so on can be created.
A switchover guarantees no data loss and is typically done for planned maintenance of the primary system.
The value is an Oracle Net service name, which is assumed to be configured properly on the FAL server system to point to the FAL client (standby database).
FAL_SERVER specifies the FAL (fetch archive log) server for a standby database.
The value is an Oracle Net service name, which is assumed to be configured properly on the standby database system to point to the desired FAL server.
Prior to Oracle 11g, Redo Apply only worked with the standby database in the MOUNT state, preventing queries against the physical standby whilst media recovery was in progress. On Logical Standby, you can query it while simultaneously applying transactions from the primary.
This is ideal for business that requires a near real-time copy of your production DB for reporting.