Unrepeatable read: thread one reads data; the data is then overwritten by thread two. Thread one tries to re-read the data but it has changed.

 
  • 線(xiàn)程1讀去了數據;不過(guò)此數據接著(zhù)被線(xiàn)程2修改了。線(xiàn)程1試圖從新讀取數據,不過(guò)數據已被修改了。
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