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NTA | UGC NET 2019 December | Question 19
Two concurrent executing transactions T1 and T2 are allowed to update same stock item say ‘A’ in an uncontrolled manner. In such a scenario, following problems may occur:
(a) Dirty read problem (b) Lost update problem
(c) Transaction failure (d) Inconsistent database state
Which of the following option is correct if database system has no concurrency module and allow concurrent execution of above two transactions?
(A)
(a), (b) and (c) only
(B)
(c) and (d) only
(C)
(a) and (b) only
(D)
(a), (b) and (d) only
Answer
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