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Which of the following cannot be used to implement a timestamp

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+1 vote
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in RDBMS by (118k points)
Which of the following cannot be used to implement a timestamp

(a) System clock

(b) Logical counter

(c) External time counter

(d) None of the mentioned

I have been asked this question by my college director while I was bunking the class.

My question is taken from Timestamp based Protocols in portion Concurrency Control of RDBMS

1 Answer

+1 vote
by (332k points)
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Best answer
The correct answer is (c) External time counter

For explanation: An external time counter cannot be used to implement a timestamp. System clock and a logical counter can be used.

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