Optimistic vs Pessimistic Locking: Handling Race Conditions in High-Contention Databases

Imagine an inventory table for an e-commerce flash sale: Item: Nintendo Switch (Stock: 1) Two customers (Alice and Bob) click "Buy Now" at the exact same millisecond. Both requests execute: SELECT stock FROM items WHERE id = 101; -- Both read: 1 -- Both check in application: stock > 0 (True!) UPDATE items SET stock = 0 WHERE id = 101; Both... Weiterlesen: Optimistic vs Pessimistic Locking: Handling Race Conditions in High-C…