How to Avoid Mixed DML Error in Salesforce Flow 2023

In the complex realm of Salesforce development, handling data manipulation language (DML) operations becomes crucial. However, sometimes, these operations can result in errors that can halt your progress. One such issue is the Mixed DML Error.

In this article, we will delve into what the Mixed DML error is, why it occurs, and most importantly, how to avoid it while working with Salesforce Flow.

Introduction to Mixed DML Error

Mixed DML Error in Salesforce occurs when you attempt to perform a combination of DML operations on both setup and non-setup objects in a single transaction. This type of transaction is not supported due to the distinct contexts in which these operations occur. The setup objects are those that control the configuration of your Salesforce org, while non-setup objects are the standard and custom records.

Understanding the Causes

DML Operations on Setup and Non-Setup Objects

When you try to update a setup object (like User or Profile) alongside a non-setup object (like Account or Contact) within the same transaction, Salesforce throws a Mixed DML Error. This is because setup objects are processed in a different, more restrictive context compared to non-setup objects.

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Context Switching

Salesforce enforces a strict separation between different contexts, such as the system context and the user context. Performing DML operations that require a context switch can trigger the Mixed DML Error. Context switching occurs when there’s a shift from one context to another, such as when transitioning from an automated process to a user-initiated process.

The Impact of Mixed DML Error

Encountering a Mixed DML Error can disrupt the execution of your code, leading to failures in your automation or transaction. It’s crucial to address this issue to ensure the smooth functioning of your Salesforce instance and the integrity of your data.

Strategies to Avoid Mixed DML Error

To sidestep the Mixed DML Error, you can employ various strategies:

Using @future Annotation

The @future annotation allows you to delegate certain DML operations to be executed asynchronously. By using this approach, you can separate the contexts of setup and non-setup objects.

Employing Queueable Apex

Queueable Apex lets you break up your transaction into multiple asynchronous processes. This can help you avoid mixing DML operations on different types of objects.

Separate Transactions for Setup and Non-Setup Objects

A reliable strategy is to split your transaction into two parts: one for setup objects and another for non-setup objects. This eliminates the possibility of mixing the two and triggering the Mixed DML Error.

Hands-on Tips for Salesforce Flow

When working with Salesforce Flow, consider these tips to steer clear of Mixed DML Errors:

Dividing Transactions

Split your flow into segments that deal with setup and non-setup objects separately. This can prevent the clash that triggers the Mixed DML Error.

Utilizing Helper Classes

Create helper classes to handle DML operations, especially when dealing with mixed contexts. This can provide a clean separation and avoid the error.

Error Handling and Logging

Implement robust error handling mechanisms and detailed logging. This can help you diagnose any issues related to DML operations and fix them promptly.

Best Practices for Preventing Mixed DML Error

To ensure a seamless Salesforce development experience, follow these best practices:

Designing Modular Flows

Create modular flows that have specific purposes. This minimizes the chances of mixing DML operations and simplifies error detection.

Testing and Deployment Considerations

Thoroughly test your flows in different contexts before deployment. This can help catch any Mixed DML Errors early and ensure a smooth rollout.

Regular Updates and Monitoring

Stay updated with Salesforce’s guidelines and updates related to DML operations. Regularly monitor your processes for any errors or anomalies.

Importance of Error-Free DML Operations

Avoiding Mixed DML Errors is not just a matter of adhering to best practices – it’s about maintaining data consistency, ensuring accurate reporting, and delivering a seamless user experience within your Salesforce environment.


In the intricate landscape of Salesforce development, the Mixed DML Error can pose a significant challenge. However, armed with the knowledge of its causes and preventive strategies, you can navigate this hurdle effectively. By implementing the techniques mentioned in this article, you can ensure that your DML operations are smooth, and error-free, and contribute to the overall success of your Salesforce projects.


  1. What exactly is a Mixed DML Error in Salesforce? A Mixed DML Error occurs when you attempt to perform DML operations on both setup and non-setup objects within a single transaction in Salesforce.
  2. Why does the Mixed DML Error happen? The error arises due to the distinct contexts of setup and non-setup objects, which cannot be mixed in a single transaction.
  3. Can using Queueable Apex completely eliminate Mixed DML Errors? While Queueable Apex helps avoid Mixed DML Errors by executing processes asynchronously, proper design and separation of contexts are still crucial.
  4. Are there any other types of DML-related errors in Salesforce? Yes, apart from Mixed DML Errors, you might encounter DML Limit Errors, DML Rollback Errors, and more, depending on how you handle your data operations.
  5. Is it necessary to create separate transactions for setup and non-setup objects? Creating separate transactions is a reliable way to prevent Mixed DML Errors, but it’s essential to evaluate your specific use case and choose the approach that best fits your requirements.

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