Which form of DML operation allows execution to occur with subsequent records even if an error occurs with a single record?

A.

The correct answer is A. Database class method.

When executing a DML (Data Manipulation Language) operation in Apex, the default behavior is that if an error occurs while processing a record, the entire transaction will be rolled back and none of the records will be saved. This ensures data consistency and integrity, but can be a problem when you need to process a large number of records and don't want to lose everything just because one record failed.

To address this issue, Salesforce provides a set of methods in the Database class that allow you to control the behavior of DML operations. One of these methods is the "Database.insert()" method, which can be used to insert a list of records into the database. If an error occurs while inserting a record, the method will return a result that indicates the status of each record, and execution will continue with the remaining records.

For example, consider the following code:

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List<Account> accounts = new List<Account>{     new Account(Name='Acme'),     new Account(Name='Contoso'),     new Account(Name=null) // invalid account with no name }; Database.SaveResult[] results = Database.insert(accounts, false); for (Database.SaveResult result : results) {     if (result.isSuccess()) {         System.debug('Account inserted successfully.');     } else {         System.debug('Error inserting account: ' + result.getErrors()[0].getMessage());     } } 

In this example, we are inserting a list of three accounts into the database. The third account has no name, which is invalid. We pass "false" as the second argument to the "Database.insert()" method, which means that if an error occurs with one record, execution will continue with the remaining records.

After the method is called, we iterate through the results array and check the status of each record. The first two records should be successful, and the third should fail. The output of the code should be:

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Account inserted successfully. Account inserted successfully. Error inserting account: Insert failed. First exception on row 0; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, Account name cannot be null.: [Name] 

As you can see, the first two accounts were inserted successfully, and the third account failed with a custom validation error. However, the code continued to execute, and we were able to handle the error appropriately.

In summary, the Database class method allows you to execute a DML operation with subsequent records even if an error occurs with a single record. This can be very useful when processing large amounts of data and you don't want to lose everything just because of one record.