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If a transaction does not modify the database until it has committed it is said to use a_______ modification technique(a) Deferred(b) Immediate(c) More than one of the mentioned(d) None of the mentionedI had been asked this question during an interview for a job.This interesting question is from Recovery and Atomicity in portion Recovery System of RDBMS

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Right ANSWER is (a) Deferred

Easiest explanation: If a transaction does not modify the database until it has committed it is SAID to use a deferred modification technique. Deferred modification has the overhead that transactions NEED to make local copies of all updated data items.



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