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[40] 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.
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