Writes will dominate reads, because once the wiki is loaded
from the file system, pages and folders will never be read.
Only resources will be read. Keeping everything in memory is
good because it is fast and easy. Memory is cheap. If I can
on a 200 Mhz machine then it is proof that
big systems can run on old computers if you store it all in memory.
I avoid database systems when I can. Smalltalk is more powerful
than a RDBMS. The file system is mostly to prevent loss of data.
This works until your image gets to 4G (which has never happened
to me). Then you have to move to a 64 bit Smalltalk.