Principles

Atomicity Consistency Isolation Durability (ACID)

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Atomicity, Consistency, Isolation, Durability is a set of properties that guarantee that database transactions are processed reliably.

Atomicity

Atomicity requires that each transaction be completed successfully, or nothing execute. A transaction consists of many steps. If any step fails, all the transactions are rolled back.

Consistency

The consistency property ensures that any transaction will bring the database from one valid state to another. The database will move from one consistent state to another if the transaction succeeds and remain in the original state if the transaction fails.

Isolation

The isolation property ensures that the concurrent execution of transactions results in a system state that would be obtained if transactions were executed serially.

Durability

The durability property ensures that once a transaction has been committed, it will remain in persistent storage.

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