beginnerLocking, MVCC & Deadlocks

What's the core difference between optimistic and pessimistic locking?

Pessimistic locking blocks other transactions immediately on read; optimistic locking allows concurrent reads and only detects a conflict at write time via a version check.

Ready to master this question?

Generate a complete walkthrough — background, the full answer in plain language, a working code example explained line by line, a real-world scenario, common mistakes, and how this same question gets asked in different ways.

Sign in to generate a response

Next Step

Continue to Why doesn't a long-running SELECT block a concurrent UPDATE under PostgreSQL's MVCC?← Back to all Transaction Mastery questions