We have already setup Oracle replication using Dataguard from a primary active site to a near DR site. The near DR is a passive site.
Is it possible to replicate from the Near DR (Passive) site to Far DR site using dataguard?
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Yes it is possible.
A cascaded redo transport destination (also known as a terminal destination) receives primary database redo indirectly from a standby database rather than directly from a primary database.
A physical standby database that cascades primary database redo to one or more terminal destinations at the same time it is applying changes to its local database files is known as a cascading standby database.
More details at the above URL.