A transaction is a single unit of work in a data base. The ACID is often used to describe the characteristics of a transaction.
ACID Stands for
- Atomicity
- Consistency
- Isolation
- Durability
Atomicity: A Transaction is a atomic unit, either all operations are defined in the transaction are completed, or none of them are completed.
Consistency:
A Transaction always leaves the data in consistent state.
Isolation:
A Transaction operates in a isolation from other database activity; other concurrent data base activity has no effect on the transaction.
Durability:
When a transaction is committed, the results are stored in persistent storage and will survive system failure.
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