GATE CS 2015 Set 2 — Question 31
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Databases → Transactions & Concurrency → ACID Properties
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Question
Consider the following transaction involving two bank accounts x and y.The constraint that the sum of the accounts x and y should remain constant is that of
read(x); x := x - 50; write(x); read(y); y:= y + 50; write(y)
Correct answer
(B) Consistency
Solution
The property that ensures the database moves from one consistent state to another is Consistency. In this case, the sum of accounts and must remain constant (conservation of money), which is a consistency constraint. If the transaction fails in the middle, Atomicity ensures rollback, but the requirement that the sum is preserved if the transaction completes successfully is Consistency.
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