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### 2.7.11 對象空轉時長
redisObject的`lru`屬性記錄了對象最后一次被命令訪問的時間。
可以通過`OBJECT IDLETIME`命令打印給定鍵的空轉時長：
- 是通過當前時間減去lru屬性得出的
- 這條命令不會改變lru屬性

如果服務器打開了maxmemory選項，并且內存回收算法為`volatile-lru`或者`allkeys-lru`，那么當服務器占用的內存數超過了maxmemory選項所設置的上限值時，空轉時長較高的那部分鍵就會被回收。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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