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Identifying standby database

If someone configured a physical standby database, how can I identify by seeing the primary database initialization parameter that one is the standby database?

If someone configured a physical standby database, how can I identify by seeing the primary database initialization parameter that one is the standby database?
To know if you are connected to the primary or standby instance, query V$INSTANCE. If the INSTANCE_ROLE parameter shows PRIMARY_INSTANCE, then this is the primary. If you were connected to the standby instance, this value would show SECONDARY_INSTANCE.

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