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                            ### 概述
redis為了內存數據的安全考慮，會把內存中的數據異步以文件形式保存到硬盤中一份，在服務器重啟之后會自動把硬盤的數據恢復到內存(redis)的里邊。數據保存到硬盤的過程就稱為“持久化”效果。
![](https://img.kancloud.cn/32/23/322366025a6f464dcbebd6726d4a3ada_2764x856.png)


### redis支持兩種持久化方式

    1. snapshotting(快照)默認方式 .
    2. append only file(縮寫aof)的方式 .

![](https://img.kancloud.cn/7c/98/7c98eefea52d0f75de486bcd8a15574a_2636x1326.png)


### 注意
如果兩種持久化方式都開啟,則以AOF為準, 因為rdb方式恢復速度較快,rdb恢復完成后再執行AOF又將里面的內容重寫的一遍. 
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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