Why is django ORM so much slower than raw SQL

Question

I have the following two pieces of code:

First, in SQL:

self.cursor.execute(\'SELECT apple_id FROM main_catalog WHERE apple_id=%s\', apple_id)
if sel         


        

Answer 1

Typically ORMs go to the trouble of instantiating a complete object for each row and returning it. Your raw SQL doesn't do that, so it won't take the penalty that incurs. For large result sets where you don't intend to use the object, it is better to bypass the ORM.