As other had said - not a good idea, better to pass the filename or maybe record by record through a pipe?
On the memory issue, adding RAM may not help if you are only on a 32-bit machine or OS. The largest address on 32-bit is (2**32)-1, which gives a process address space of 4GB. Of this the kernel reserves a sizeable chunk - up to half (2GB) on some operating systems. Then you have the run-time libraries, perl itself, etc. using up address space. A 64-bit machine (in theory) has a limit of 16-Exobytes.
Then some operating systems (Windows) pre-allocate the heap-size at compilation time, which by default is only 1MB on Visual Studio. There are ugly hacks around this limit, but I doubt perl employs them.
Back to the drawing board I think.
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