when i create module export all product to file.csv, but i have problem with memory ascending, how to fix it?
data about more 500000 record
How are you exporting the products?
I'm not sure if you're using Magento's dataflow or a custom solution.
In that case maybe you'll need to check if you're module is using the best methods that you can use to export that amount of data.
I can't say more about the process because is a custom module. It depends on which method are you using for read and save the information (are you gettin the whole collection? are you using custom adapters for dataflow?).