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How do I get a mixed DML error in Salesforce?
You must insert or update these types of sObjects in a different transaction to prevent operations from happening with incorrect access-level permissions. For example, you can’t update an account and a user role in a single transaction.
How do you avoid a mixed DML error in Salesforce?
Use @future to Bypass the Mixed DML Error in a Test Method Mixed DML operations within a single transaction aren’t allowed. You can’t perform DML on a setup sObject and another sObject in the same transaction.
How does Validation rule work in data loader?
Yes, validation rules work while importing data through data loader. Dataloader creates a success and an error file and if you have a validation rule that causes dml operation to fail, dataloader creates a column in error file giving a brief description of the error.
How does DML exception handling work in apex?
During the first attempt, the runtime engine processes all records. Any record that generates an error due to issues such as validation rules or unique index violations is set aside. If there were errors during the first attempt, the runtime engine makes a second attempt that includes only those records that did not generate errors.
Do you deactivate validation rules when importing data?
Yes, you are absolutely right in thinking that it is not a good practise to deactivate the validation rules when importing data and again activate them once importing is done. So now you can easily import data and once you are done , you can go back to the user record and again update the user alias back to ‘Ravi’.
How to trigger a DML exception for test coverage?
You can use FOR UPDATE to lock a certain record, but it would be locked to the testing transaction, so it might not give you the DML Exception you want. How dependant are you on the content of the DML Exception? If you just want an exception of the correct type use Test.isRunningTest () to deliberately cause the exception.