Troubleshooting Error: Mixed DML Exception in Salesforce

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What is a Mixed DML Exception?

The Mixed DML Exception occurs in Salesforce when you attempt to perform DML operations on both non-setup objects (such as Account or Contact) and setup objects (like User or Group) within a single transaction. This restriction is in place because Salesforce does not allow mixing these two types of operations to maintain data integrity.

Why Are You Seeing This Error?

If you encounter a Mixed DML Exception, it indicates that your code is trying to modify records from both categories in one go. This often happens in scenarios where you’re creating or updating user records while also handling other standard or custom objects.

How to Avoid This Error

To prevent Mixed DML Exception errors in your Salesforce development, consider the following strategies:

1. Use @future Annotation

Apex class code executes synchronously, meaning it processes actions in the order they are called. To perform DML operations on Salesforce sObject records asynchronously, utilize the @future annotation on methods. This allows you to handle setup and non-setup DML operations in separate transactions, avoiding the Mixed DML Exception.

2. Implement System.runAs

Another effective approach is to use System.runAs within your code block. This method allows you to execute code in the context of a specified user, enabling you to separate the operations on setup and non-setup objects effectively.

Conclusion

The Mixed DML Exception can be a common stumbling block for Salesforce developers, but with proper coding practices, it can be easily avoided. By using the @future annotation for asynchronous processing and implementing System.runAs when necessary, you can navigate around this limitation and ensure your code runs smoothly without errors. Always remember to test your code thoroughly to catch potential issues before deployment.

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