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If a transaction does not modify the database until it has committed, it is said to use the ___________ technique.

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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

I had been asked this question in my homework.

My doubt stems from Recovery topic in division Recovery System of Database Management

1 Answer

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Best 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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