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Author Question: Which of the following is not true of database recovery through reprocessing? A) Reprocessing ... (Read 152 times)

nummyann

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on: Jul 7, 2018
Which of the following is not true of database recovery through reprocessing?
 
  A) Reprocessing makes use of a database save.
  B) Reprocessing takes the same amount of time as did processing in the first place.
  C) Reprocessing will always return the database to its exact previous state.
  D) Reprocessing requires a record of all transactions since the last time the database was saved.
  E) All of the above are true of reprocessing.

Question 2

Which of the following is true about identifiers of entities?
 
  A) Identifiers must be unique.
  B) Identifiers are not normally used in a naming role.
  C) The value of an identifier may identify a set of entity instances.
  D) Identifiers may not be more than two attributes.
  E) An identifier in the E-R model is equivalent to a key in the relational model.


sierrahalpin

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Reply #1 on: Jul 7, 2018
Answer to Question 1

C

Answer to Question 2

C


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