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If needed to split a node or coalesce it with its siblings, or redistribute key values between siblings, the crabbing protocol locks the parent of the node in ____________ mode.

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If needed to split a node or coalesce it with its siblings, or redistribute key values between siblings, the crabbing protocol locks the parent of the node in ____________ mode.

(a) Shared

(b) Exclusive

(c) Read only

(d) None of the mentioned

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

This interesting question is from Concurrency in Index Structures topic in division Concurrency Control of Database Management

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The correct option is (b) Exclusive

The best explanation: Crabbing protocol moves in a crab like manner down the index tree.

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