What are PostgreSQL deadlocks and how can I resolve them?

What are PostgreSQL deadlocks and how can I resolve them?

PostgreSQL deadlocks occur when two or more transactions block each other, preventing them from proceeding. To resolve them, you can use techniques like proper transaction management, locking strategies, and monitoring tools.

What are some common causes of deadlocks in PostgreSQL?

Common causes include competing transactions trying to acquire locks on the same resources in different orders, long-running transactions, and insufficient isolation levels.

How can I monitor deadlocks in PostgreSQL?

You can monitor deadlocks by enabling the deadlock_timeout parameter and checking the PostgreSQL logs for deadlock reports. Additionally, using tools like pgAdmin can help visualize lock contention.

Are there any best practices to avoid deadlocks?

Yes, best practices include keeping transactions short, accessing tables in a consistent order, and using lower isolation levels when appropriate.