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It turns out that these kinds of data errors have names, and there are a bunch of them. And if the charge doesn’t work, they’ll get their order for free. If something goes wrong in the middle of this group of operations but the system continues executing them, the user will get charged the wrong amount. Apply the purchase to user’s balance / charge credit card
#Acid transaction update
Update order quantity in the pending orders table Let’s take a look at a quick example that a company like Amazon might run into: - User updates order quantity and clicks “order now” → You’ve seen it, you’ve dealt with it, and it can mean disaster for your underlying data.
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Any number of things can happen when you’re trying to write to your database: you can lose connection to a remote instance, you can encounter value errors, or anything else under the sun. The thing about transactions, though, is that they can go very wrong.
#Acid transaction code
Your application code is constantly making transactions every time you sign up a new user or that user updates their account information. A database transaction is a series of logically grouped database operations: insert a row here, update a record there, and more stuff like that. All the things that can go wrong with your transactionsĭata Scientists worry about long analytical queries and warehousing, but for developers, databases are all about transactions. But what’s going on behind the hood? Most modern SQL DBs use transactional standards like ACID to ensure data integrity and keep your users from seeing wrong or stale data, and this post explores how they work. Thankfully, the databases you’re using - like MySQL and Postgres - take special measures to make sure that doesn’t happen. When you’re building and maintaining an application, the last thing you want to worry about is data integrity Charging a customer the wrong amount or losing their data can be catastrophic.