ORA-01567：dropping log string would leave less than 2 log files for instance string (thread string)
错误码
错误描述：dropping log string would leave less than 2 log files for instance string (thread string)
错误原因：Dropping all the logs specified would leave fewer than the required two log files per enabled thread.
解决方法：Either drop fewer logs or disable the thread before deleting the logs. It may be possible to clear the log rather than drop it.
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