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In order to maintain transactional integrity and database consistency, what technology does a DBMS deploy?

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In order to maintain transactional integrity and database consistency, what technology does a DBMS deploy? (a) Triggers (b) Pointers (c) Locks (d) Cursors The question was posed to me in an interview for job. I would like to ask this question from Lock-Based Protocols in division Concurrency Control of Database Management

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Right choice is (c) Locks For explanation: Locks are used to maintain database consistency.

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