Once the DBMS informs the user that a transaction has been successfully…

Concept

The ACID properties describe four independent guarantees of transaction processing. Durability is the post-commit guarantee: after the system acknowledges a commit, recovery must preserve that transaction’s effects across failures.

A DBMS commonly supports this guarantee with stable recovery information, such as a write-ahead log whose commit record is made durable before success is reported.

Application

The stem says the transaction has already been reported as successfully completed and asks for the guarantee that its effects survive a later crash. That condition identifies durability.

Contrast and cross-check

• Atomicity governs all-or-nothing completion and rollback of partial work.

• Consistency governs preservation of integrity rules between valid database states.

• Isolation governs interference among concurrently executing transactions.

• Durability governs the continued effect of an acknowledged commit after recovery.

Result

Therefore, the property is durability.