In an online bank application that transfers funds from a checking account to a savings account, if a debit is made successfully from the checking account, the _____ property ensures that the corresponding credit is made to the savings account.

Question

BlackTom AI · Accepted Answer

The scenario describes a financial transfer where money is moved from a checking account to a savings account within an online banking system. The crucial idea here is that the two operations—the debit from the checking account and the credit to the savings account—must be treated as a single, indivisible unit of work. If one part succeeds and the other fails, the system would be left in an inconsistent state.

First, consider what each property in a database transaction stands for: atomicity means that a series of operations either all occur or none occur, preserving system integrity. In this context, the debit and the corresponding credit should be executed together; if the debit succeeds but the credit fails, funds could be removed from the checking account without appearing in the savings account, which is unacceptable.

Second, alternate properties you might encounter in discussions of transactions include consistency, isolation, and durability (the ACID properties). While these are all relevant to transactional systems, the specific requirement that both sides of a transfer happen together maps most directly to atomicity. Consistency would ensure that the system remains in a valid state before and after the transaction, isolation would ensure concurrent transactions do not interfere, and durability would guarantee that once committed, the changes persist even after failures. However, none of these alone guarantee the exact all-or-nothing behavior described for both debit and credit in a single transfer.

Third, you can reason about potential failure modes: if the transfer is implemented without atomicity, you could encounter partial completion, such as the debit succeeding but the credit not, or vice versa. Atomicity protects against this by ensuring that the entire transfer is committed as a unit or rolled back entirely if any part fails.

Fourth, given the question's framing—'the _____ property ensures that the corresponding credit is made to the savings account' when a debit occurs—the natural answer is atomicity, since it enforces the all-or-nothing execution of both operations within the transfer.

If there were to be other options such as durability, consistency, or isolation, those address different aspects of transactional behavior and would not by themselves guarantee the bi-directional, paired execution required for a transfer. Hence, atomicity is the property most closely aligned with ensuring the debit and its matching credit occur together as a single, indivisible operation.

In an online bank application that transfers funds from a checking account to a savings account, if a debit is made successfully from the checking account, the _____ property ensures that the corresponding credit is made to the savings account.单项选择题

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