The Memory Exhaustion Trap In B2B SaaS engineering at Smart Tech Devs, giving enterprise clients the ability to export data—such as downloading 500,000 application logs, customer lists, or transaction histories into a CSV—is a mandatory requirement. The immediate reflex for many backend developers is to fetch the rows from the database, build the file payload entirely in PHP memory, and use Storage::download() or response()->download() . For small datasets, this works fine. But when the dataset grows, your application will crash. If you load 500,000 Eloquent records into memory to generate a CSV file, PHP will instantly breach its memory_limit , throwing a fatal Allowed memory size exhausted error. Your server drops the request, leaving the client with an empty download and a broken dashboard. To scale safely, you must stream files incrementally.…