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#### 15.4.5、隔離級別的作用范圍
             

? 事務隔離級別的作用范圍分為兩種：

– 全局級：對所有的會話有效

– 會話級：只對當前的會話有效

? 例如，設置會話級隔離級別為READ COMMITTED ：

mysql> SET TRANSACTION ISOLATION LEVEL READ COMMITTED；

或：

mysql> SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED；

? 設置全局級隔離級別為READ COMMITTED ：

mysql> SET GLOBAL TRANSACTION ISOLATION LEVEL READ COMMITTED；
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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