I'm using MiKTex 2.9.4196 with TeXnicCenter 2.0 beta on Windows 7. As I have to compile very large tikzpictures I use tikz externalize. Nevertheless some tikzpicture still produce an error.
! TeX capacity exceeded, sorry [pool size=3147270].
I already did increase the main memory, but I couldn't find out how to change the pool-size.