Make sure script runs until it finishes process

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I have a form where user is supposed to post large amount of data for processing (say more than 50,000 rows of data). How do I make sure that those data get processed? I consider using set_time_limit(0) set max_execution_time to zero, but I was told that the script might still terminates because of some other setting in Apache.

 

I think BigDump has similar capability but I dont know how it works .. something like the script restarts itself before timeout and continue processing? Any help is appreciated. Thanks!