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If a node is locked in __________ explicit locking is being done at a lower level of the tree, but with only shared-mode locks.

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If a node is locked in __________ explicit locking is being done at a lower level of the tree, but with only shared-mode locks.

(a) Intention lock modes

(b) Intention-shared-exclusive mode

(c) Intention-exclusive (IX) mode

(d) Intention-shared (IS) mode

I had been asked this question at a job interview.

Enquiry is from Multiple Granularity topic in section Concurrency Control of Database Management

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Right answer is (a) Intention lock modes

Easiest explanation - There is an intention mode associated with shared mode, and there is one with an exclusive mode.

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