When a transaction processing system creates a transaction, it will ensure that the transaction will have certain characteristics.These characteristics are known as the ACID properties. ACID is an acronym for atomicity, consistency, isolation, and durability.
Atomicity : The atomicity property identifies that the transaction is atomic. An atomic transaction is either fully completed, or is not begun at all.
Consistency : A transaction enforces consistency in the system state by ensuring that at the end of any transaction the system is in a valid state.
Isolation : When a transaction runs in isolation, it appears to be the only action that the system is carrying out at one time.
Durability : A transaction is durable in that once it has been successfully completed, all of the changes it made to the system are permanent.
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