What is the performance difference between “insert ignore” and replace in MySQL?

Question

I would like to know if there is a difference in terms of performance between insert ignore and replace orders in MySQL.

I am using MySQL 5

Answer 1

Just a general comment. Insertion implies that what was there before remains. Replacing implies that something that is there already is targeted for removal and the item for insertion is installed in its place. The replacing action must inherently target a item that is already there, remove it and install the new item.