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=== Physical standby (Redo Apply) ===
A physical standby database replicates the exact contents of its primary database across the [[Oracle Net]] [[network layer]]. While the relative physical storage locations can differ, the data in the database will be exactly the same as the primary database. It can function either in managed-recovery mode or in read-only mode, but not in both modes at the same time unless the databases are at Oracle Database 11.1 or higher and the Active Data Guard option is licensed (See below).It uses the Redo apply technology.
=== Logical standby (SQL Apply) ===
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