Adobe Exam AD0-E704 Topic 6 Question 14 Discussion

You are integrating an external system from which products and categories will be synchronized with Magento.

To keep the category tree synchronized, an identifier attribute needs to be added to the catalog_category entity. The identifier value is generated by the external system as an unsigned 3 byte integer and is global in scope. Your code will run many concurrent queries to select categories based on this ID in order to synchronize changes.

Keeping performance in mind, what attribute backend type do you choose when creating the EAV attribute?