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                            ## redis緩存類型

### 1. 緩存覆蓋
當你的mysql數據庫掛掉了或者你手動關閉了connect，你的網站絕大多數網頁頁面仍然能刷出來。

### 2. 激活緩存
查詢的時候,發現緩存沒有了(失效了),那么這次就從mysql中查詢,再寫入redis緩存.下次來的時候,就走緩存,不走數據庫。

### 3. 熱點緩存
哈希值目前存在,但有效期只剩下1分鐘了(生命周期共10分鐘),此時,又有一次訪問時,再把時間刷新一下,又變成10分鐘。

## 緩存邏輯
![](https://box.kancloud.cn/c173dfe0ab7d11a4f165329e482be862_784x544.png)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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