Lectures

Learn how the READ COMMITTED transaction isolation level works in PostgreSQL: its features, pros, cons, usage examples, and tips for safe transaction handling.

Learn how the REPEATABLE READ transaction isolation level in PostgreSQL prevents Non-Repeatable Read anomalies, keeps your data stable within a single transaction, and check out its pros, limitations, and real-world use cases.

Learn how the SERIALIZABLE transaction isolation level in PostgreSQL gives you max protection from parallel access anomalies, blocks phantom reads, and keeps your data consistent even in the craziest scenarios. Examples, use cases, and gotchas—everything you need to know for safe transaction handling.

Find out what transaction anomalies are in databases: Dirty Read, Non-Repeatable Read, and Phantom Read. We'll break down with examples how they show up, why they're dangerous, and how to pick the right isolation level to avoid mistakes and data loss.

In this article, we’ll check out the most common mistakes people make when working with transactions in databases, plus ways to avoid them. This material will be useful for both beginners and experienced devs who want to make their apps more reliable.