When "Ignore on conflict" is selected, ILIAS ignores an action, if it can not be performed (e. g. an "Insert" action is not done, if there is already a user with the same login in the database.)\nWhen "Update on conflict" is selected, ILIAS updates the database if an action can not be performed. (e. g. an "Insert" action is replaced by an "Update" action, if a user with the same login exists in the database).