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                ## Redis專題五:持久化 [TOC] ### RDB快照 > Redis默認的持久化方式 默認情況下,Redis將數據集的快照保存在磁盤上名為的二進制文件中`dump.rdb`。既可以配置Redis在數據集中至少有M個更改的情況下,每隔N秒保存一次數據集,或者可以直接調用`SAVE`(同步)或`BGSAVE`(異步)命令。 例如,如果更改了至少1000個鍵,配置Redis每60秒自動將數據集轉儲到磁盤: ~~~ save 60 1000 ~~~ ### AOF僅追加文件(Append-only file) AOF持久化會把被執行的寫命令寫到AOF文件的末尾,記錄數據的變化,每執行一條更改Redis數據的命令,都會把該命令追加到AOF文件中 - 優點: 數據更完整,安全性更高,秒級數據丟失(最多丟失1秒的數據) - 缺點: 對于相同的數據集,AOF文件的體積要大于RDB文件,數據恢復也會比較慢
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