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                            # 主鍵設計

1. 強烈建議使用 INT/BIGINT并且自增做為主鍵，順序insert效率更高，表空間碎片率更低
2. 主鍵避免采用字符型，如VARCHAR/CHAR/UUID，會導致原本可以順序寫入的請求變成隨機寫入，效率更低
3. 如果需要用UUID產生一個較大的隨機數，則可用uuid_short() 來代替，uuid_short()會生成bigint類型數據
4. 拆分時如果需要全局唯一主鍵，可采用發號器服務、 redis的全局自增，或某個全局DB里統一分配等多種方式生成全局唯一值



                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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