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In _______ schemes, each write operation creates a new version of Q

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In _______ schemes, each write operation creates a new version of Q

(a) Multiversion

(b) Snapshot isolation

(c) Lock based

(d) Timestamp

The question was asked in examination.

My query is from Multiversion Schemes, Snapshot Isolation topic in portion Concurrency Control of RDBMS

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Best answer
The correct choice is (a) Multiversion

Easiest explanation: In multiversion schemes, each write operation creates a new version of Q. When a transaction issues a read operation, the concurrency control manager selects one of the versions of Q to be read.

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