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    Oracle Error ORA-38855: cannot mark instance string (redo thread string) as enabled

    admin November 27, 2024 No Comments

    Oracle Error Message

    ORA-38855: cannot mark instance string (redo thread string) as enabled

    Reason for the Error

    The standby switchover or failover operation failed because it needs to mark an instance (redo thread) as enabled. However, it had less than 2 online redo logs, which prevented it from being enabled.

    Solution

    Add more logfiles to the specified instance and retry the command.

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