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Which of the following does cursor stability ensure

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Which of the following does cursor stability ensure

(a) The tuple that is currently being processed by the iteration is locked in shared mode

(b) The tuple that is currently being processed is not locked in shared mode

(c) Any modified tuples are not locked in exclusive mode

(d) None of the mentioned

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This interesting question is from Insert, Delete Operations and Predicate Reads in portion Concurrency Control of RDBMS

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The correct answer is (a) The tuple that is currently being processed by the iteration is locked in shared mode

Explanation: Cursor stability ensures that the tuple that is currently being processed by the iteration is locked in shared mode and any modified tuples are locked in exclusive mode until the transaction commits.

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