This is a tricky question. I need to set up several wordpress areas on my site that should have one login. Let say I have four separate "sites" (e.g. /mag /wiki /shop / directory) all on one install. It seems that each area could result in a large database and if that went down, it would take everything down. The magazine itself grew to 400MB quickly. This leads me to believe that multisite in one database is not a good idea. So I was looking at this:
The ability to have several different networks/installs on the same domain sharing one user database and meta data. I'm hoping to have wiki.mysite.com and shop.mysite.com - in separate databases - all using one user table and meta data.
(1) Do I need to have separate installs on every subdomain? (I believe the answer is yes.)
(2) Are there instructions on how to set this up?