ACID : Java Glossary

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ACID

ACID (Atomicity, Consistency, I and Durability) referring to databases. These are considered to be the key transaction processing features/properties of a database management system. Without them, the integrity of the database cannot be guaranteed. In practice, these properties are often relaxed somewhat to provide better performance.

Atomicity
all or nothing. You get only completed transactions committed to your database.
Consistency
means that when a transaction finishes, the database must be in a logically consistent state. You can’t leave work to be done later to clean up.
Isolation
the illusion that transactions each have the database to themselves without any interference from other transactions.
Durability
refers to the guarantee that once the end user has been notified of success, the transaction will persist and not be undone. It will survive even a system crash.

Wikipedia on ACID : no pun intended

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ACID : Java Glossary

Atomicity

Consistency

Isolation

Durability