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
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