why cant import when the file is big?

some customers find that they get a problem when import, it just gives a XML error, that’s because there’s too much data and no enough memory for php. find the php.ini for your apache line: memory_limit it could be like 16M or 20M, try change it bigger, say 64M so it looks like memory_limit = 64M save and exit, remember restart your apache before give the try.