Hands-On Microservices with Kubernetes

Understanding ACID

A common measure of data integrity is that all transactions that modify data have the ACID properties:

• Atomic: All operations in the transaction succeed or they all fail.
• Consistent: The state of the data complies with all constraints before and after the transaction.
• Isolated: Concurrent transactions behave as if serialized.
• Durable: When a transaction completes successfully, the results are persisted.

The ACID properties are not specific to relational databases, but often used in that context, mostly because the relational schemas, with their formal constraints, provide a convenient measure of consistency. The isolation property often has serious performance implications and may be relaxed in some systems that prefer ...