Question at position 27 A business transaction requires:human intervention.a stored procedure.several actions against the database.a trigger.

Question

BlackTom AI · Accepted Answer

A transaction groups multiple database operations into a single atomic unit, so that either all operations succeed or none do (atomicity). This is the key concept behind a business transaction.

1) Relevant knowledge points and concepts
- Transaction: a logical unit of work that may include several actions (INSERT/UPDATE/DELETE) on the database.
- ACID properties: Atomicity (all-or-nothing), Consistency (database moves from one valid state to another), Isolation (transactions don’t interfere), Durability (committed changes persist).
- Stored procedure: a program stored in the database that can perform actions and may contain transaction control, but it is a mechanism, not the definition of a transaction.
- Trigger: an automatic routine fired by certain events (INSERT/UPDATE/DELETE), again a mechanism that can participate in transactions.
- Human intervention: optional and unrelated to the definition of a transaction.

2) Step-by-step reasoning
- A business transaction exists when multiple database actions must be treated as a single unit. Example: transferring $100 from Account A to Account B requires two actions: debit A and credit B. If only one action completes, data integrity is broken.
- Because a transaction must ensure both actions commit or both roll back, it necessarily involves several actions against the database grouped together.
- While a stored procedure can implement a transaction and a trigger can participate, neither is required to define a business transaction. Human intervention is not required for a transaction to exist.

3) Intermediate demonstration (conceptual)
- Step 1: Begin transaction.
- Step 2: Execute action 1 (debit A).
- Step 3: Execute action 2 (credit B).
- Step 4: Commit if both succeed; otherwise rollback.

4) Why the correct answer is correct
The essence of a business transaction is that multiple related database operations are executed as one atomic unit. Therefore "several actions against the database" precisely describes this requirement.

5) Why other options are incorrect
- "Human intervention.": Not required — transactions are programmatic.
- "A stored procedure.": A tool to implement transactions, not required.
- "A trigger.": An automatic response mechanism, not the defining requirement.

Conclusion: The correct answer is "several actions against the database." This matches the provided answer.

Question at position 27 A business transaction requires:human intervention.a stored procedure.several actions against the database.a trigger.单项选择题

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