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                ## **原理:** ![](https://img.kancloud.cn/15/29/15297cb9361b36b6a72bb9e8b8d9567b_701x442.png) 整體上來說,復制有 3 個步驟: 1. master 將改變記錄到二進制日志(binary log)中(這些記錄 叫做二進制日志事件,binary log events) 2. slave 將 master 的 binary log events 拷貝到它的中繼日志 (relay log) 3. slave 重放中繼日志中的事件,將改變反映它自己的數據。 ***** ## **常用架構:** ![](https://img.kancloud.cn/01/16/0116da3615a5546cecc0c2fa2b422cc2_817x450.png) ***** ## **MySQL 主從復制企業應用場景:** * 從服務器作為主服務器的實時數據備份 * 主從服務器實時讀寫分離,從服務器實現負載均衡 * 把多個從服務器根據業務重要性進行拆分訪問
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