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How many techniques are available to control concurrency on B+ trees?

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How many techniques are available to control concurrency on B+ trees?

(a) One

(b) Three

(c) Four

(d) None of the mentioned

I got this question during an interview.

The above asked question is from Concurrency in Index Structures in chapter Concurrency Control of Database Management

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Best answer
The correct choice is (d) None of the mentioned

Easiest explanation - Two techniques are present.

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