What should be set as the Choice action on a field map to prevent creating stray global records?

To prevent the creation of stray global records, setting the Choice action on a field map to "Ignore" is the correct approach. This action ensures that any incoming data mapped to that particular field is not processed or recorded, thereby preventing the generation of new global records that may not be intended or relevant for the existing dataset.

Using "Ignore" allows for flexibility in data handling, especially when there may be incoming data that does not have a corresponding or desired outcome in the system. This is particularly useful in scenarios where certain mappings might lead to erroneous or unwanted entries, helping maintain the integrity and cleanliness of the records within the system.

In contrast, other choices such as "Update" would actively make changes to existing records, "Delete" would remove data, and "Set to Default" would replace values with predefined defaults. Each of these actions would potentially contribute to the creation of new or altered records rather than preventing them, which is not the goal when trying to avoid stray global records.