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                ## 緩存一致性問題 先更新數據庫,再刪除緩存。如果刪除緩存失敗了,那么會導致數據庫中是新數據,緩存中是舊數據,數據就出現了不一致。 解決思路:先刪除緩存,再更新數據庫。如果數據庫更新失敗了,那么數據庫中是舊數據,緩存中是空的,那么數據不會不一致。因為讀的時候緩存沒有,所以去讀了數據庫中的舊數據,然后更新到緩存中。
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