Which of the following is an essential feature of the ACID

Solution

The ACID properties of a database transaction ensure reliable processing of transactions, even in the presence of power outages, crashes, or other failures. These properties are:

• Atomicity : This ensures that a transaction is treated as a single "unit," which either completes entirely or has no effect at all (it is rolled back). This prevents partial updates that could lead to inconsistent database states.
• Consistency : A transaction takes the database from one consistent state to another.
• Isolation : Transactions are isolated from each other to prevent interference.
• Durability : Once a transaction is committed, its effects are permanent, even in the case of a system crash.

• A is incorrect because automatic rollback is part of atomicity , but it is not the defining feature.
• B is incorrect because while transactions must be consistent, they do not need to be processed sequentially.
• C is incorrect because transactions can be executed concurrently as long as they are isolated and do not conflict.
• D is incorrect because transaction isolation is crucial for maintaining data integrity, and transactions should not interfere with each other unless they are properly synchronized.