ORA-38858：cannot mark redo thread string as enabled
错误码
错误描述：cannot mark redo thread string as enabled
错误原因：The open resetlogs or standby activation 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.
解决方法：Recreate the control file with a larger MAXINSTANCES value.
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