A database transaction is a unit of interaction with a
database management system or similar system that is treated in a coherent and reliable way independent of other transactions. In general, a database transaction must be
atomic, meaning that it must be either entirely completed or aborted. Ideally, a
database system will guarantee the properties of Atomicity, Consistency, Isolation and Durability (
ACID) for each transaction. In practice, these properties are often relaxed somewhat to provide better performance.
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