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                            ### 方案一：主動遷移+被動遷移

* 主動遷移：主動遷移就是一個獨立的外掛遷移程序，其作用是遍歷需要分庫分表的源表，將這里的數據復制到分庫分表后的目標表中，由于主動遷移和被動遷移會一起運行，所以需要處理主動遷移和被動遷移碰撞的問題；
* 被動遷移就是與源表相關的業務代碼自身將數據遷移到分庫分表后對應的表中；

### 方案二：整表遷移
擴容時只需要移動表，原來在DB2中的256-383整體遷移到db3，384-511遷移到db4
![](https://img.kancloud.cn/24/52/24526894f96aa763394cf2ae086850f2_1012x538.png)


【參考資料】

https://dbaplus.cn/news-159-1949-1.html




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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