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If a node is locked in ______________ the subtree rooted by that node is locked explicitly in shared mode, and that explicit locking is being done at a lower level with exclusive-mode locks.

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If a node is locked in ______________ the subtree rooted by that node is locked explicitly in shared mode, and that explicit locking is being done at a lower level with exclusive-mode locks.

(a) Intention lock modes

(b) shared and intention-exclusive (SIX) mode

(c) Intention-exclusive (IX) mode

(d) Intention-shared (IS) mode

The question was posed to me in an internship interview.

Question is from Multiple Granularity topic in division Concurrency Control of Database Management

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The correct option is (b) shared and intention-exclusive (SIX) mode

To explain: There is an intention mode associated with shared mode, and there is one with an exclusive mode.

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