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Que. Which of the following scenarios may lead to an irrecoverable error in a database system ?
a. A transaction writes a data item after it is read by an uncommitted transaction
b. A transaction reads a data item after it is read by an uncommitted transaction
c. A transaction reads a data item after it is written by a committed transaction
d. A transaction reads a data item after it is written by an uncommitted transaction
Answer:A transaction reads a data item after it is written by an uncommitted transaction
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