How to distinguish an atomic operation from one that ensures data consistency in information storage systems?

An atomic operation is an indivisible operation that is executed completely or not at all, without the possibility of interruption. In the context of data storage systems, atomicity guarantees that the operation will not be partially applied.

Ensuring data consistency is a broader concept that means that after an operation, the data remains in a correct and coherent state according to business rules and constraints.

How to distinguish:

• Atomicity is a property of an individual operation (for example, a write or update), guaranteeing its integrity.
• Consistency is a property of the entire system or transaction, ensuring that after the operation, the data complies with the specified rules.

Example: in a database, a transaction may consist of several atomic operations. If all succeed, the system transitions to a consistent state. If one operation fails, the transaction is rolled back to maintain consistency.

Thus, atomicity is a building block for achieving consistency in data storage systems.