To avoid creating duplicate Contacts, a customer frequently uses Data Loader to upsert Contact records into Salesforce. What common error should the data architect be aware of when using upsert?
A.
Errors with duplicate external Id values within the same CSV file.
B.
Errors with records being updated and inserted in the same CSV file.
C.
Errors when a duplicate Contact name is found cause upsert to fail.
D.
Errors with using the wrong external Id will cause the load to fail.
Data Loader uses external Id fields to match records in the CSV file with records in Salesforce during an upsert operation. If the CSV file contains duplicate external Id values within the same file, Data Loader will throw an error saying “Duplicate Id Specified” and will not process those records. Therefore, it is important to ensure that the CSV file does not have any duplicate external Id values before using Data Loader to upsert records.
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