United HealthGroup Interview Question Java Developers
Country: India
Interview Type: In-Person
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The ACID properties are atomic, consistent, isolated, and durable.
- dianachih January 19, 2013- Atomic means that a transaction cannot be subdivided. The transaction is all or nothing.
- Consistent means that a transaction satisfies integrity constraints after completion.
- Isolated means that transactions do not interfere with each other except in allowable ways. A transaction should never overwrite changes made by another transaction. In addition, a transaction may be restricted from interfering in other ways such as not viewing the uncommitted changes made by other transactions.
- Durable means that any changes resulting from a transaction are permanent. No failure will erase any changes after a transaction terminates.
Concurrency control and recovery management ensure that transactions meet the ACID properties. Recovery management involves actions to deal with failures such as communication errors and software crashes. Concurrency control involves actions to control interference among multiple, simultaneous users of the database.