19.4. The ACID properties of transactions
Putting together the points made in the discussion above, a transaction may be defined as having the following properties:
| Atomicity | Either all or none of the transaction's operations are performed. |
| Consistency | A transaction transforms the system from one consistent state to another. |
| Isolation | An incomplete transaction cannot reveal its result to other transactions before it is committed. |
| Durability | Once a transaction is committed the system must guarantee that the results of its operations will persist, even if there are subsequent system failures. |
Note that these properties relate to the definition of transactions and do not imply particular methods of implementation. The effect on system state of running ...
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