Sagas revolutionize transaction management in distributed systems, offering a scalable alternative to ACID transactions. This article explores how sagas coordinate microservices through local, reversible steps, using choreography or orchestration. Learn their core concepts, implementation strategies with idempotent designs, advantages like fault tolerance, and trade-offs compared to ACID, with practical tips for building resilient applications.

How do databases ensure data correctness under concurrency and failure? This article breaks down ACID properties, isolation levels, MVCC, and WAL, explaining how relational systems like PostgreSQL maintain consistency and performance.