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Locks placed by command are called ________ .

  • A.implicit locks
  • B.explicit locks
  • C.exclusive locks
  • D.shared locks

Answer: B

Correct answer: explicit locks

An explicit lock is one the application asks for by issuing a command; an implicit lock is one the DBMS places on its own initiative to enforce isolation. The distinction is about who requests the lock. Shared and exclusive describe something different - what the lock permits others to do - so the two classifications are independent.

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