If a transaction does not modify the database until it has committed, it is said to use the ___________ technique.
A. Deferred-modification
B. Late-modification
C. Immediate-modification
D. Undo
Answer:A
If a transaction does not modify the database until it has committed, it is said to use the ___________ technique.
A. Deferred-modification B. Late-modification C. Immediate-modification D. Undo
Explanation:Deferred modification has the overhead that transactions need to make local copies of all updated data items; further, if a transaction reads a data item that it has updated, it must read the value from its local copy.