问题 填空题

严格两阶段锁协议要求对______更新的封锁必须保持到事务的终点。

答案

参考答案:未提交事务

解析: 严格两阶段封锁协议除了要求封锁是两阶段之外,还要求事务提交之前持有的所有排他锁必须在事务提交后方可释放,这个要求保证未提交事务所写的任何数据在该事务提交之前均以排他方式加锁,防止了其他事务读这些数据。

单项选择题
完形填空
完形填空。
     It was freezing outside my car. I did not want to get out of it when we passed by a small grocery shop.
Suddenly I   1   a tiny figure, bent and covered with some bits of cloth, trembling with the   2   from the
harsh winds that were blowing so   3   that night.
     It was only 5 degrees that evening, which was freezing cold indeed. Here was an old man of 75,   4   in
the corner of this store, waiting for anyone who would think of   5   him a single coin or a cup of hot tea.
     I asked my   6   to go over and hand this old man   7  . He looked into my husband's face and smiled,
and said, "Thank you." I felt so   8   and I prayed for the old man to live   9   the cold night.
     I was sure to visit again and find out  10  he was the next day, as I have to pass this way every day. I did
so the  11  evening, and he remembered the car and came up to my  12  and smiled at me. This time I  13  him
a bag of food. He reached out for the bag  14  I gave him my hand. He held it and smiled and said, "May God
bless you." I looked at the old man and asked my husband, "Doesn't he  15  you of someone? With that cap on
his head and the  16  in his eyes and the warmth of his hand, I could tell you this: he reminds me of my  17 ."
     At a closer look, I saw my Daddy in this old man, waiting for anyone to show him some mercy or  18 . I
do hope all of you who read this, will remember that maybe one day, it could happen to one of us, so please do
not  19  by a poor person without offering at least a word of love and a kind smile or a(n)  20  of kindness of
any kind.
( )1. A. watched  
( )2. A. cold    
( )3. A. fast   
( )4. A. sitting  
( )5. A. paying   
( )6. A. driver   
( )7. A. anything 
( )8. A. happy    
( )9. A. across   
( )10. A. what    
( )11. A. former  
( )12. A. seat    
( )13. A. offered 
( )14. A. but     
( )15. A. remind  
( )16. A. anger  
( )17. A. friend  
( )18. A. love    
( )19. A. run     
( )20. A. deed    
B. looked      
B. anger         
B. hard       
B. sleeping     
B. serving        
B. husband     
B. something   
B. upset       
B. off           
B. where       
B. next        
B. kitchen      
B. supplied     
B. yet          
B. warn        
B. worry         
B. brother     
B. hate         
B. pass         
B. behavior       
C. observed       
C. excitement      
C. heavy          
C. selling        
C. leaving            
C. friend          
C. everything     
C. disappointed    
C. over           
C. how             
C. last           
C. room            
C. provided         
C. and              
C. remember     
C. calm               
C. father         
C. praise          
C. drive           
C. act         
D. noticed      
D. warmth         
D. strong       
D. working      
D. borrowing        
D. brother       
D. nothing     
D. thankful      
D. through       
D. why              
D. latter      
D. window                 
D. sold           
D. or            
D. inform      
D. smile           
D. mother       
D. surprise       
D. ride          
D. step