I have both the 7.0 and the 10.1 Galaxy Tab 2 and neither has a micro USB port. It comes with the 30 pin USB cord which will plug into the computer USB port or the wall adapter to charge it. You can get an OTG adapter which will accept a USB- flash drive, mouse, keyboard, etc. Look on Amazon or eBay for the OTG. Or Check Fry's. I found some there for about $7?.
I have found the OTG dongles extremely useful for transfering things through a flash drive. I can watch movies from the flash drive that way also. I find it easier than connecting the cord to the computer.