What is the role of ACID in database consistency?

Can you explain what ACID means in the context of databases?

ACID stands for Atomicity, Consistency, Isolation, and Durability. It's a set of properties that ensure reliable processing of database transactions.

How does each component of ACID contribute to database consistency?

Atomicity ensures that all parts of a transaction are completed successfully or none at all. Consistency ensures that a transaction brings the database from one valid state to another. Isolation ensures that transactions occur independently without interference, and Durability guarantees that once a transaction is committed, it remains so even in the event of a system failure.

Can you give an example of how a failure might affect these properties?

Sure! If a transaction is only partially completed due to a failure, Atomicity ensures that it rolls back to maintain consistency. For instance, if money is being transferred from one account to another, both accounts must reflect the change; if one fails, the entire transaction fails.

Why is ACID important for applications like banking?

ACID is crucial for banking applications because it ensures that all transactions are processed reliably, maintaining the integrity of financial data and preventing issues like double spending.