ORA-28429：cannot encrypt or decrypt a data file on standby when it is open read-only
错误码
错误描述：cannot encrypt or decrypt a data file on standby when it is open read-only
错误原因：An attempt was made to encrypt or decrypt a data file on a standby database when it was already opened in read-only mode.
解决方法：Restart the standby instance in mount mode and retry the command.
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