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                            ## **多線程復制**
**MySQL5.5 及以前的復制：**
一般主從復制有三個線程且都是單線程：
* Binlog Dump（主）? ‐‐> IO Thread（從）? ‐‐>? ? SQL Thread（從）。

而 master 這邊是通過并發線程提交，事務通過 LSN 寫入 binlog；但是 Slave 只有一個 IO 線程和 SQL 線程，是單線程， 所以在業務大的情況下就很容易造成主從延時。

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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