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MCQs

Total Questions : 40 | Page 4 of 4 pages
Question 31. The transaction log contains a copy of every database record (or page) after it has changed. These records are called before images.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 32. Locks placed by command are implicit locks.
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 33. The lost update problem is when User A reads data that have been processed by a portion of a transaction from User B.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 34. Database administration refers to a function that applies to the entire organization.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 35. Two transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately are referred to as serializable transactions.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True
Question 36. The goal of database security is to ensure that only authorized users can perform authorized activities at authorized times.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 37. A phantom read occurs when a transaction rereads data it has previously read and finds modifications or deletions caused by a committed transaction.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 38. A transaction is a series of actions to be taken on the database so that either all of them are performed successfully or none of them are performed at all.
  1.    False
  2.    True
 Discuss Question
Answer: Option B. -> True
Question 39. A point of synchronization between the database and the transaction log is generally referred to as a stop point.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 40. An exclusive lock locks the item from change but not from read.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False

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