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The part of a database management system which ensures that the data remains in a consistent state is

  • A.authorization and integrity manager
  • B.buffer manager
  • C.transaction manager
  • D.file manager

Answer: C

Correct answer: transaction manager

The transaction manager ensures that every transaction takes the database from one consistent state to another, committing all of its changes or none of them. The buffer and file managers move pages, and the integrity manager checks constraints on individual operations.

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