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                Redis:Remote Dictionary Server(遠程字典服務器) Redis是當前比較熱門的NOSQL系統之一,它是一個開源的使用ANSI c語言編寫的key-value存儲系統(區別于MySQL的二維表格的形式存儲。)。和Memcache類似,但很大程度補償了Memcache的不足。和Memcache一樣,Redis數據都是緩存在計算機內存中,不同的是,Memcache只能將數據緩存到內存中,無法自動定期寫入硬盤,這就表示,一斷電或重啟,內存清空,數據丟失。所以Memcache的應用場景適用于緩存無需持久化的數據。而Redis不同的是它會周期性的把更新的數據寫入磁盤或者把修改操作寫入追加的記錄文件,實現數據的持久化 - - - - - -
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