A client of ours has a huge magento product database and they requested the ability to do mass updates to those products. At first we decided to have them use the Import/Export section of the site but because of the size of the product database it wasn’t possible. Then we decided to use the profile system in a cron but, considering all of the products in the database are configurable, and the profile system ignores configurable products that wouldn’t work either. So we landed on pulling the Import/Export system into a nightly cron.
and here it is