Final answer:
The ACID model ensures reliability and consistency of database transactions, focusing on atomicity, consistency, isolation, and durability.
Step-by-step explanation:
The ACID model is a set of principles that ensures the reliability and consistency of database transactions. ACID stands for:
- Atomicity: This means that a transaction is treated as a single, indivisible unit of work. It either completes successfully and commits all changes, or fails and rolls back all changes to the previous state.
- Consistency: This means that each transaction must bring the database from one consistent state to another. The integrity constraints of the database must be maintained at all times.
- Isolation: This means that each transaction must execute independently of other transactions. Intermediate results of a transaction should not be visible to other transactions until it is committed.
- Durability: This means that once a transaction is committed, its changes are permanent and will survive any subsequent failures, such as system crashes or power outages.
The ACID model is crucial in ensuring the correctness and reliability of database transactions, especially in situations where multiple transactions may be occurring concurrently or where failures can happen.