ORA-38857: cannot mark redo thread string as enabled
Cause: The standby switchover or failover operation failed because it needs to mark a redo thread as enabled. However, the control file was recreated with a MAXINSTANCES value smaller than the thread number of the redo thread.
Action: Recreate the control file with a larger MAXINSTANCES value.
Cause: The standby switchover or failover operation failed because it needs to mark a redo thread as enabled. However, the control file was recreated with a MAXINSTANCES value smaller than the thread number of the redo thread.
Action: Recreate the control file with a larger MAXINSTANCES value.
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