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                            Innodb采用的是兩階段鎖定協議.在事務執行過程中,隨時都可以執行鎖定,鎖只有在執行commit和rollback的時才會被釋放,并且所有的鎖是同一時刻被釋放

前面描述的都是隱式鎖定,Innodb會根據隔離級別在需要的時候自動加鎖

另外,Innodb也支持通過特定的語句進行顯示鎖定,這些語句不屬于sql規范(盡量避免使用)

~~~
select ... lock in share mode

select ... for update
~~~

mysql也支持這些語句,這是服務層實現的,和存儲引擎無關.他們有自己的用途,但并不能替代事務處理,


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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