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When is a timestamp allotted

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in RDBMS by (118k points)
When is a timestamp allotted

(a) When execution begins

(b) When execution is taking place

(c) When execution is completed

(d) None of the mentioned

This question was posed to me in an online interview.

I would like to ask this question from Transaction Isolation Levels topic in division Transactions of RDBMS

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Best answer
Right answer is (a) When execution begins

The best I can explain: Timestamp is allotted when execution of a transaction begins.

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