Oracle Error ORA-16669: instance cannot be opened because the Active Data Guard option is disabled

Oracle Error Message

ORA-16669: instance cannot be opened because the Active Data Guard option is disabled

Reason for the Error

The attempt to open the instance failed because the Active Data Guard option was not enabled and Redo Apply was either running or was about to be started by the Data Guard broker.

Solution

Stop Redo Apply or set the database state to APPLY-OFF and then open the database.

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