Concurrency with MongoDB Explained
Let’s move back to practical usage and look at MongoDB since it’s the most used NoSQL database for Node.js applications.
MongoDB doesn’t guarantee ACID compliance in all cases. For example, MongoDB doesn’t have transactions and atomic functions that cover multiple documents. So if you have a database model where you need to avoid concurrency issues with multiple documents at the same time, you’re in trouble. For example, you might have an e-commerce application that needs to decrement the number of products in the warehouse inventory while at the same time withdrawing money from the user’s wallet.