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Which of the following is a variant of snapshot isolation

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Which of the following is a variant of snapshot isolation

(a) First committer wins

(b) First updater wins

(c) More than one of the mentioned

(d) None of the mentioned

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

This interesting question is from Multiversion Schemes, Snapshot Isolation topic in chapter Concurrency Control of RDBMS

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Correct option is (c) More than one of the mentioned

The best I can explain: First committer wins and first updater wins are two different variations of snapshot isolation.

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