In an ACID-compliant database, what occurs when two identical orders are received simultaneously with a store credit?

In an ACID-compliant database, maintaining consistency and isolation is crucial when handling simultaneous operations. The concept of ACID stands for Atomicity, Consistency, Isolation, and Durability, all of which work together to ensure that transactions are processed reliably.

When two identical orders with store credit are received at the same time, the isolation property of ACID comes into play. This ensures that each transaction is executed in isolation from others, meaning that one transaction cannot see the intermediate state of another transaction. In this case, when the first order is being processed, the second order will be effectively blocked from proceeding in a way that could violate business rules or data integrity.

Hence, one order will be processed successfully based on the available store credit or inventory, while the second order will not be allowed to complete because the conditions it relies on have changed due to the already processed order. This prevents issues like double processing or over-committing credits, which could lead to inconsistencies—upholding the integrity of the database and ensuring that transactions adhere to the rules established by the application.

This ensures that the total state of the database after the transactions is consistent and reflects only valid operations. Therefore, one order is processed while the other is rejected due to the changes