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I have a very large data file (2GB-3GB). I need to parse some data out of it and check if there is a duplication. So I have a empty string to start with, so data that I parse out from input file, will be check against this string. If it is not already there, append it. This string can potential be very very long. Is it dangerous?
It is not dangerous. You just might have not enough memory to store a very very long string. So will encounter out of memory error.