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                            ## 一、什么是數據庫的讀寫分離
       如果數據庫壓力很大，一臺機器支撐不了，name可以用mysql復制實現對臺
       機器同步，將數據庫的壓力分散
         
         
       前面做負載均衡
             master   
                         inset   delete  update
              slava    select
                        mysql1  mysql2   ，mysql3 
            
         輪詢表  每個一定時間就進行輪詢
                      mysql  ip  state    
                 
       
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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