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Which of the following scenarios may lead to an irrecoverable error in a database system?

  1. A transaction writes a data item after it is read by an uncommitted transaction
  2. A transaction reads a data item after it is read by an uncommitted transaction
  3. A transaction reads a data item after it is written by a committed transaction
  4. A transaction reads a data item after it is written by an uncommitted transaction
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The standard Definition of irrecoverability is that a Transaction reads a data item that is written by an Uncommitted Transaction. 

Answer: Option D

Answer:

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