When implementing an inventory module in a Ruby on Rails application, ensuring consistency in stock levels is crucial. If multiple users try to purchase the same item simultaneously, concurrency issues can lead to overselling. In this post, we’ll explore two approaches to handling inventory management: using a simple counter with database locks to prevent race conditions & improving performance and reliability using SKIP LOCKED for efficient inventory allocation.

https://blog.arkency.com/handling-concurrency-with-database-locks-and-skip-locked/