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An operation is said to be __________ if executing it several times in a row gives the same result as executing it once.

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An operation is said to be __________ if executing it several times in a row gives the same result as executing it once. (a) Idempotent (b) Changed (c) Repetitive (d) All of the above I had been asked this question in class test. This key question is from Lock Release and Undo Operations topic in chapter Recovery System of Database Management Select the correct answer from above options Interview Questions and Answers, Database Interview Questions and Answers for Freshers and Experience

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Right option is (a) Idempotent The best I can explain: Operations such as inserting an entry into a B+-tree may not be idempotent, and the recovery algorithm must therefore make sure that an operation that has already been performed is not performed again.

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