1.

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) UndoI had been asked this question in my homework.My doubt stems from Recovery topic in division Recovery System of Database Management

Answer»

The correct OPTION is (a) Deferred-modification

The best 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.



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