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Database Systems MCQs – Mock Test 242

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Modification of Database MCQs – Mock Test 242 PDF Download

MCQ 1206: To insert data into a relation, we specify a tuple to be:

  1. Retrieved
  2. Processed
  3. Tested
  4. Inserted

MCQ 1207: A protocol that permits a transaction to lock a new data item only if it has not yet unlocked any data item, is called:

  1. Two-phase unlocking protocol
  2. One-phase locking protocol
  3. Two-phase locking protocol
  4. One-phase unlocking protocol

MCQ 1208: The first part, which is the upper half of the rectangle, contains the name of:

  1. All attributes
  2. Entity set
  3. Schema
  4. Domain

MCQ 1209: The aggregate function that returns the number of the elements in the collection is known as:

  1. total
  2. count
  3. whole
  4. combine

MCQ 1210: The rolling back of any transaction takes place at the stage of:

  1. Partially committed
  2. Aborted
  3. Active
  4. Committed

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