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Under ________ the system uses locking mechanism that applies only to updates

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Under ________ the system uses locking mechanism that applies only to updates

(a) First updater wins

(b) First committer wins

(c) First writer wins

(d) None of the mentioned

This question was addressed to me by my college director while I was bunking the class.

I'd like to ask this question from Multiversion Schemes, Snapshot Isolation in chapter Concurrency Control of RDBMS

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Correct option is (a) First updater wins

To elaborate: Under first updater wins, the system uses a locking mechanism that applies only to updates. Read operations do not get affected by this mechanism.

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