What is the primary purpose of the COMMIT operation in a database management…
2025
What is the primary purpose of the COMMIT operation in a database management transaction?
- A.
To permanently apply all changes made during the transaction
- B.
To temporarily save the changes for testing
- C.
To rollback the transaction to its initial state
- D.
To check the consistency of the database schema
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Correct answer: A
The primary purpose of the COMMIT operation in a database management transaction is to permanently save all changes made during the transaction to the database.
Note for more understanding
In database management systems, transactions are governed by the ACID properties (Atomicity, Consistency, Isolation, Durability). The COMMIT operation is the mechanical trigger for both Atomicity and Durability.
The Concept of a Transaction: A transaction is a bundle of multiple SQL statements that must execute as a single unit of work. For example, a bank transfer requires deducting money from Account A and adding it to Account B.
Staging Area: While these operations are running, the changes are kept in a provisional state. Other database users cannot see these modifications yet (due to Isolation).
Making it Permanent: If all statements within the transaction execute perfectly without errors, the application issues a COMMIT command. This tells the database engine to write these changes safely from the temporary memory buffers directly onto the hard disk transaction logs.
Once the COMMIT completes, the transaction is officially closed, the changes become permanent, visible to all users, and resilient even in the event of a sudden power failure or system crash.