WordPress MU

Again I have destroyed my wordpress MU, I was sorting out old tables for plugins I dont use anymore when I think I destroyed the wrong table. Now none of my blogs can use pages, they just get an error 404, which table have I deleted and whats its structure/ how can I correct it?

I havent deleted wp_posts,

also I deleted all the tables for a blog and also the blog entry in wp_blogs but I dont think that would have done it.

Learning why backing up before tinkering is a good thing to do, huh?

Doh!

Oh boy :SLAP:

oh well, I just created a new MU system then creted a PHP script to open one database and save all data then open the next database and synchronise with it! It ended up that I had deleted postmeta(or something similar).