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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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